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How to Set Up eM Client: Complete 2026 Setup Guide

Hands-on eM Client setup guide for 2026: install on Windows or Mac, free license activation, Gmail/Outlook/IMAP accounts, import, and first-week tips.

Alexis Dollé By Alexis Dollé · ·
How to Set Up eM Client: Complete 2026 Setup Guide

eM Client 10.4 is the current release line in 2026, with service update 10.4.5326.0 landing on April 9, 2026 — and the December 2025 jump to 10.4 brought a “major sync optimization” plus POP3 OAuth for Microsoft 365 and Gmail that most installation guides on the web have not caught up to yet. I set this up on a clean Windows 11 machine and a Mac mini M2 the same morning to write the steps that actually work in 2026, from the .msi download through Free license activation, OAuth account setup, PST import from Outlook, calendar sync, and the first-week settings that decide whether the client clicks for you or not.

Download and install eM Client on Windows, Mac, or Linux

Download eM Client directly from emclient.com/download — the page auto-detects your OS and serves either the Windows .msi installer or the macOS .dmg. There is no official Linux build and no roadmap entry for one; Linux users should pick Thunderbird with the built-in calendar instead. The installer is around 110 MB, runs as a standard system installer, and finishes in under two minutes on a typical SSD.

The download itself is a 30-second job, but a few install choices are worth getting right on the first run.

Windows install (10.4.5326.0 as of April 9, 2026):

  1. Open https://www.emclient.com/download in Edge or Chrome. The page hands you setup.msi for the current build. Save it; do not run from temp.
  2. Double-click the .msi. Accept the EULA. Default install path is C:\Program Files (x86)\eM Client — leave it unless your IT policy demands otherwise.
  3. The installer creates a Start menu shortcut and registers eM Client as a default mail handler option. You can decline the default-mail association at first launch if you want to test before committing.
  4. The first-run window opens directly to the account wizard. The 30-day Pro trial begins here automatically; license selection comes at day 30.

Mac install (10.4 current):

  1. Open https://www.emclient.com/download on the Mac. The page detects macOS and offers the .dmg.
  2. Double-click the .dmg. Drag the eM Client icon into Applications. Eject the disk image.
  3. First launch: macOS Gatekeeper asks to confirm an app downloaded from the internet. Click Open. eM Client requests Contacts and Calendar permissions through the standard macOS privacy dialog — accept both to enable the full feature set, or decline and grant later in System Settings.
  4. The account wizard appears. Same flow as Windows from here on.

Linux: there is no native build. Workarounds in community forums involve Wine or virtual machines, but eM Client does not officially support either path. If you are on Linux, this is where the eM Client story ends — close the tab and try Thunderbird instead. Our best email clients for Windows 2026 roundup covers the cross-platform alternatives in more detail for anyone weighing the platform constraint.

System requirements that bite in practice: Windows 10 build 1809 or later (Windows 7 and 8 are out of support), macOS Big Sur or later, around 200 MB of disk space for the app itself, and another 1 to 5 GB of cache depending on how aggressively you sync attachments locally. Reserve more if you plan to indexed-search large PDF and Office attachments.

License activation: 30-day Pro trial then Free or paid

eM Client gives every new install a 30-day Pro trial with no card required and no account creation gate. At day 30 you pick one of three paths: keep using Free with a two-account ceiling for personal use, buy Personal at €39.95/year or €59.95 lifetime for unlimited accounts and Pro features, or buy Business at €49.95/year per device for commercial use. The Free license is registered to an email address but stays free forever.

The trial-to-license decision is the place most new eM Client users get tripped up, because the Free tier is real but it has two limits the marketing copy does not foreground.

During the 30-day trial: every paid feature is unlocked — thread view, email snooze, undo send, mass mail, the AI add-on, unlimited accounts. Use the trial deliberately. If you only ever touch two accounts and do not miss thread view or snooze, the Free tier will work for you. If you find yourself using snooze five times a day or running mass mail for a client newsletter, the Personal plan is the honest answer.

Free license activation:

  1. At day 30 (or earlier — Menu, Help, License, Activate Free license), eM Client opens a registration screen.
  2. Enter your name and email. eM Client emails an activation link within seconds.
  3. Click the link in your inbox. eM Client receives the token, the Free license activates, and the two-account ceiling kicks in.
  4. If you already have three or more accounts configured during the trial, eM Client will not delete them automatically — it disables sync on the excess accounts until you remove them or upgrade.

Paid license activation: purchase from emclient.com/pricing. The order confirmation email contains an activation key. In eM Client: Menu, Help, License, Activate Pro license, paste the key, click Activate. Personal licenses cover up to three devices per single user, Business is per device.

For users who find eM Client’s UI density or the two-account ceiling restrictive, Mailbird offers a more visual approach with an integrations dock for Slack and WhatsApp inside the email window. If your decision is genuinely between the two, our Mailbird vs eM Client 2026 comparison walks through the trade-offs head to head.

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First account: Gmail, Outlook, or IMAP setup

eM Client’s account wizard auto-detects server settings from the email address for every major provider. Gmail and Outlook connect via OAuth 2.0 in around 90 seconds — no app passwords, no IMAP server lookup. Generic IMAP accounts (Fastmail, Zoho Mail, ProtonMail Bridge, custom domains) require manual entry of the IMAP and SMTP server hostnames, ports, and SSL settings, which most providers publish in their help docs.

The wizard opens automatically on first launch. You can also reach it later via Menu, Accounts, Add account.

Gmail OAuth setup (the easy path):

  1. In the Add account dialog, choose Mail, then Other (or Google directly if shown).
  2. Enter your Gmail address. eM Client recognises the @gmail.com domain and offers OAuth.
  3. Click Continue. Your default browser opens to Google’s consent screen. Sign in if needed.
  4. Approve the eM Client scopes: read/send/modify mail, manage calendar, manage contacts, manage tasks.
  5. The browser hands the token back to eM Client. Initial sync starts. A roughly 40,000-message account takes around 8 minutes to fully index on a 100 Mbps connection.

Gmail labels appear as folders in the eM Client folder tree, stars sync correctly, and Google Categories show as filterable conditions in the rules engine. The Free tier does not include Conversation view, so threading on Gmail looks flatter than in the web UI — that is a Pro feature.

Outlook.com / Microsoft 365 personal OAuth:

  1. Enter the @outlook.com, @hotmail.com, or @live.com address.
  2. eM Client detects Microsoft as the provider, opens the browser to login.live.com.
  3. Sign in, approve eM Client’s scopes (Mail.ReadWrite, Calendars.ReadWrite, Contacts.ReadWrite).
  4. Sync starts. Outlook.com folders, categories, and contacts appear within seconds for a fresh account.

IMAP manual setup (Fastmail, Zoho, custom domains):

  1. Choose Mail, then Other in the wizard.
  2. Enter your email and password. eM Client tries autodiscovery first.
  3. If autodiscovery fails (common for self-hosted or smaller providers), the manual screen opens. Fill in:
    • Incoming server: IMAP host, port (usually 993), SSL/TLS encryption.
    • Outgoing server: SMTP host, port (usually 587 with STARTTLS or 465 with SSL), authentication required.
  4. Save. eM Client tests the connection and reports green/red on each step.

The 10.4 release added POP3 OAuth for Microsoft 365 and Gmail in December 2025 — relevant if you specifically want POP behaviour (mail downloaded and removed from the server) on a modern OAuth-only provider. For 99% of users IMAP is the right protocol; pick POP only if you have a defined reason.

Microsoft 365 and Exchange via Modern Auth

eM Client connects to corporate Microsoft 365 and on-premises Exchange 2016 or later via Modern Authentication (OAuth 2.0) and EWS — no app passwords, no legacy IMAP workaround, no IT exception in most environments. Add the corporate email address in the wizard, eM Client autodetects via Microsoft’s Autodiscover service, the browser opens for SSO sign-in, and after consent the full mailbox, calendar, contacts, and Global Address List sync down.

This is the setup path where eM Client genuinely outshines most Outlook alternatives. The flow:

  1. Menu, Accounts, Add account. Enter the corporate email (e.g. you@yourcompany.com).
  2. eM Client queries Microsoft’s Autodiscover for the domain. Within a second or two the wizard reports “Exchange Web Services detected” and shows the discovered EWS endpoint.
  3. Click Continue. Your default browser opens to your organisation’s SSO page (login.microsoftonline.com, or your federated identity provider if your tenant uses one).
  4. Sign in. If your tenant has conditional access policies — multi-factor authentication, compliant device requirements, sign-in risk policies — complete them in the browser.
  5. Approve the eM Client app’s scopes. The browser hands the token back.
  6. eM Client begins syncing: mailbox folders including any shared mailboxes you have delegate access to, the calendar with meeting rooms and resources, your contacts plus the Global Address List, and out-of-office settings.

One conditional access caveat worth flagging. Some Microsoft 365 tenants enforce Intune-managed device or Outlook-only app policies. If your IT team has set the “Approved client apps” condition strictly, eM Client may be blocked from connecting because it is not on Microsoft’s approved-apps list. The error in eM Client surfaces as a generic OAuth failure; the actual block is in the tenant policy. Check with your IT lead before deploying eM Client across a managed team.

Exchange via EWS was a major reason I moved my work mailbox to eM Client in the first place — Thunderbird only added EWS in Release 145 in November 2025, and Mailbird still leans on IMAP. eM Client has had clean Modern Auth + EWS for several versions longer than either alternative.

Import from Outlook, Thunderbird, or Apple Mail

eM Client’s first-run wizard offers to import from Outlook (PST and OST files), Thunderbird, Apple Mail, Windows Mail, Windows Live Mail, and Incredimail. PST imports up to several gigabytes complete reliably — I imported a 2.1 GB PST with around 18,000 messages and 240 calendar items without errors on Windows 11. If you skip the wizard on first launch, the same dialog is available later via Menu, File, Import.

The import dialog is split by source. The Outlook path is the most common and the one with the most edge cases worth knowing.

Outlook PST/OST import (Windows):

  1. Menu, File, Import. Choose “Import from Microsoft Outlook” if Outlook is installed on the same machine, or “Import from .pst file” for a standalone file.
  2. Point eM Client at the .pst (or let it discover the active Outlook profile).
  3. Pick which folders to import: Inbox, Sent, custom folders, Calendar, Contacts, Tasks. The default is everything.
  4. Choose the destination account — useful if you have multiple accounts already configured and want the imported mail to land under one specifically.
  5. Click Import. A 2 GB PST takes around 6 to 10 minutes on a typical SSD.

Folder hierarchy, message flags (read/unread, importance, follow-up), categories, and contacts all transfer. Outlook rules do not — eM Client has a different rules engine, so plan to rebuild filters by hand if your Outlook setup depends on them.

Thunderbird import: eM Client auto-discovers the Thunderbird profile directory on the same machine and offers to import accounts, messages, and address book. Useful if you are migrating; less useful if Thunderbird is on a different machine, in which case export Thunderbird mail to .mbox first.

Apple Mail import (Mac): the importer reads Apple Mail’s local message store and the contacts from the system address book. Calendar events from the Calendar app are not imported — those sync directly via CalDAV when you add the account to eM Client.

A practical migration tip from doing this twice: do not switch off the old client until you have verified all the imported folders look right in eM Client. The import is non-destructive, but discovering three weeks later that one obscure subfolder did not come across is no fun.

Calendar, contacts, and tasks sync

eM Client’s calendar, contacts, and tasks are first-class features, not bolt-ons. Adding a Google, Microsoft, or iCloud account through the account wizard automatically configures CalDAV/CardDAV/EWS for calendar and contacts — no second account to create, no separate sync setup. Standalone CalDAV/CardDAV servers (Nextcloud, Fastmail, Posteo) configure under Menu, Accounts, Add, choosing CalDAV or CardDAV explicitly.

The integrated calendar is the feature that separates eM Client from most Outlook alternatives. Mailbird treats the calendar as an embedded web view of Google Calendar — useful but offline-incapable. eM Client syncs your events down locally, so the calendar works without a connection, recurring events render correctly with full RRULE support, and meeting invitations from your inbox open the calendar accept/decline flow natively.

Verifying calendar sync after account setup:

  1. Click the calendar icon in the left sidebar.
  2. Confirm that today’s events appear, week and month views render correctly, and recurring meetings show as a series, not duplicates.
  3. From an email containing a meeting invitation, click Accept — eM Client should update the event in the calendar and send the response back to the organiser.

Adding a second CalDAV calendar (e.g. a Nextcloud personal calendar alongside your Google work calendar):

  1. Menu, Accounts, Add account. Choose Calendar, then CalDAV.
  2. Enter the CalDAV server URL (Nextcloud’s is typically https://yourdomain.com/remote.php/dav).
  3. Enter username and password.
  4. eM Client discovers the calendars on the server and lets you pick which to sync.

The sidebar agenda widget — visible by default in the right-hand pane — is the small UX touch that genuinely matters for day-to-day use. It shows the next three or four events without switching tabs. Combined with the unread mail badge per account in the folder tree, the sidebar gives you the at-a-glance state that Outlook users miss most when they switch.

First-week settings that pay off

Five settings adjusted in the first week of using eM Client noticeably change the experience for the better: enable Conversation view (Pro), set up at least one rule for newsletter routing, configure a per-account signature, turn on the AI add-on if you bought Personal, and customise the sidebar widgets to show today’s agenda. None of these are mandatory, but each pays back the five minutes it takes to set up many times over.

The settings I configure on every new eM Client install:

  • Conversation view (Pro feature): Menu, Settings, Mail, Read. Switch from flat list to Conversation view. Threads collapse to one row in the message list — closer to Gmail’s behaviour and a measurable time saver on busy inboxes.
  • Newsletter rule: Menu, Rules, New rule. Condition: From contains “newsletter” or specific sender domains. Action: Move to a Newsletters folder, mark as read. The hour you spend tuning this rule across two weeks of mail saves the equivalent every month afterwards. For the broader picture on cutting newsletter volume in the first place, our roundup of the best unsubscribe tools for 2026 is the right next step.
  • Per-account signature: Menu, Accounts, pick an account, Signatures, New. Set a default signature per account so replies from your work address do not leak personal signature text. eM Client supports plain-text and HTML signatures, with per-account defaults for new mail and replies separately.
  • AI add-on activation (Personal license required): Menu, Help, License, AI add-on. The 10.0 release in July 2024 introduced generative AI for compose, reply, and tone adjustment; the 10.4 release improved it. Worth a session of experimentation before deciding whether it earns its keep — for me, the “shorten this draft” action sticks; the “write from scratch” one does not.
  • Sidebar widgets: Menu, Settings, Appearance, Sidebar. Add Agenda, Recent communications, and Attachments. The Agenda widget is the one that pays off daily — today’s meetings visible without leaving the mail tab.

For broader inbox discipline on top of these settings, our email organisation system covers the folder structure, label/category strategy, and review cadence that scales independent of which client you use.

Common gotchas during eM Client setup

There are five specific failure modes worth knowing before you hit them, because each has a non-obvious fix.

  • Two-account ceiling on Free is not a soft limit. Add a third account during the trial and Free activation will disable sync on the excess accounts — it will not delete them. The fix is either remove an account (Menu, Accounts, select, Remove) or upgrade to Personal. There is no Free-tier-with-three-accounts loophole.
  • Conditional access policies block Modern Auth without a clear error. If your Microsoft 365 tenant requires “approved client apps” only, eM Client returns a generic OAuth failure. The fix is on the IT side — adding eM Client to the approved apps list or relaxing the conditional access scope for your account.
  • Outlook PST imports require Outlook installed for some PST versions. ANSI PSTs (pre-Outlook 2003) and password-protected PSTs sometimes need an active Outlook install on the machine to read. Unicode PSTs from Outlook 2007 onward import standalone. If your PST is ancient or protected, install Outlook temporarily for the import, then uninstall.
  • CalDAV/CardDAV manual URL paths trip up self-hosted users. Nextcloud’s full CalDAV URL is https://yourdomain.com/remote.php/dav — not the calendar share URL you might find in the Nextcloud web UI. Each self-hosted provider has its own path; checking the provider’s CalDAV docs before adding the account saves a frustrating ten minutes.
  • POP3 OAuth is new in 10.4 and not yet supported by all providers. December 2025’s 10.4 release added POP3 OAuth for Microsoft 365 and Gmail specifically. Other providers (Yahoo, Apple iCloud, smaller IMAP hosts) still require IMAP for OAuth-based authentication. If you need POP and OAuth on a non-Microsoft, non-Google account, you may be stuck with IMAP instead.

For deeper background on eM Client beyond setup, our full eM Client review 2026 covers the day-to-day experience, the Pro feature trade-offs, and how it lands against alternatives on Windows and Mac.

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Alexis Dollé, founder of Email Tools
Alexis Dollé
Founder & Editor

Alexis Dollé, email expert for 10+ years. Founder of Email Tools. I test every email client and utility myself, then write about them the way I’d explain them to a friend — no marketing fluff, no sponsored rankings, every claim sourced.

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Sources & references
  1. eM Client — Pricing page. Free tier (2 accounts, personal non-commercial), Personal €39.95/year or €59.95 lifetime (3 devices/user), Business €49.95/year or €79.95 lifetime per device, 30-day trial. Accessed 2026-05-31. emclient.com/pricing
  2. eM Client — Release history. v10.4.5326.0 (April 9, 2026), 10.4.5298.0 hot fix for Hotmail/Outlook (April 2, 2026), 10.4.4124.0 major v10.4 with sync optimization and POP3 OAuth (December 4, 2025), v10.0 generative AI integration (July 2024). Accessed 2026-05-31. emclient.com/release-history
  3. eM Client — Features overview. Mail, calendar, contacts, tasks, chat, AI features, S/MIME and PGP encryption, automatic backup, sidebar widgets, import from Thunderbird/Outlook/Apple Mail/Windows Mail/Incredimail. Accessed 2026-05-31. emclient.com/features
  4. eM Client — Download page. Windows .msi installer (current build 10.4), macOS .dmg, no Linux build, 30-day Pro trial included. Accessed 2026-05-31. emclient.com/download
  5. Email Tools — eM Client review 2026. email-tools.me/posts/em-client-review-2026/
  6. Email Tools — Mailbird vs eM Client 2026. email-tools.me/posts/mailbird-vs-em-client-2026/
  7. Email Tools — Best email clients for Windows 2026. email-tools.me/posts/best-email-clients-windows-2026/

Frequently asked questions

Is eM Client free to use after setup?

Yes. eM Client’s Free license stays free forever for personal, non-commercial use on up to two email accounts, registration required. The Free tier covers IMAP, POP3, Gmail OAuth, Outlook/Microsoft 365 OAuth, the built-in calendar, contacts, tasks, and chat. The Free license does not include thread view, email snooze, undo send, mass mail, the AI add-on, or commercial use — those require a Personal subscription at €39.95/year or a lifetime license at €59.95. Run the 30-day Pro trial first to decide whether you genuinely need the paid features before activating the Free tier.

How do I activate the Free license in eM Client?

After the 30-day Pro trial ends, eM Client prompts you with a license screen. Choose Free license, then register with your email address — eM Client emails you an activation link, click it, and the Free tier activates with the two-account ceiling enforced. You can also switch from a paid trial to Free at any time via Menu, License, Activate Free license. The Free tier is for personal use only; even a freelancer doing client work technically needs a Personal subscription under eM Client’s terms.

How do I connect Gmail to eM Client?

Open eM Client, click Menu, Accounts, Add, and type your Gmail address. eM Client autodetects Google as the provider and opens your default browser to Google’s OAuth 2.0 consent screen. Sign in, approve the eM Client app permissions for mail, calendar, contacts, and tasks, and the browser hands the token back to eM Client. Initial sync starts immediately — a 40,000-message Gmail account takes around 8 minutes to fully index on a 100 Mbps connection. No app password and no two-factor workaround needed; OAuth is the supported path.

Can I import my old mail from Outlook or Thunderbird into eM Client?

Yes, directly. The first-run wizard offers to import from Outlook (PST files), Thunderbird, Apple Mail, Windows Mail, Incredimail, and a few legacy clients. If you skip it during setup, you can trigger it later via Menu, File, Import. Outlook PST import works on files up to several gigabytes — I imported a 2.1 GB PST with around 18,000 messages without errors on Windows 11. Folder structure, message flags, and contacts come across; calendar items import correctly if Outlook is installed on the same machine.

Does eM Client work on Mac and Linux?

Mac yes, Linux no. eM Client has had a native macOS build since 2021 — same features as Windows including Exchange via EWS, calendar, contacts, and the AI add-on. The Mac app installs as a standard .dmg and runs on Apple Silicon natively. There is no official Linux build and no roadmap entry for one. Linux users wanting a calendar-integrated email client should look at Thunderbird with the built-in calendar instead. The mobile apps for iOS and Android are free and pair with a desktop license.

What is eM Client 10.4 and do I need it?

eM Client 10.4 is the current release line as of May 2026, with the most recent service update 10.4.5326.0 shipped on April 9, 2026. The major 10.4 release in December 2025 brought sync optimization, faster message loading, POP3 OAuth for Microsoft 365 and Gmail, customizable conversation view, and an undo for move actions. If you are installing eM Client today the installer on emclient.com is already on 10.4, so you do not pick a version — you just download the current build. Existing v10.0 to v10.3 users should accept the auto-update prompt for the sync performance gains alone.

Related: eM Client review 2026 — the full day-to-day verdict and Pro trade-offs. Mailbird vs eM Client 2026 — head-to-head if you are choosing between them. Best email clients for Windows 2026 — the wider field of options.