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Free Microsoft Outlook Alternatives

The best free alternative to Microsoft Office Outlook is Thunderbird, which is also Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft Office Outlook and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Microsoft Office Outlook are K-9 Mail, eM Client, Evolution and Mailspring.

Microsoft Office Outlook alternatives are mainly Email Clients but may also be Calendar Apps or Todo List Managers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Microsoft Office Outlook.
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Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with...

Learn more about Microsoft Office Outlook

  1. Thunderbird icon

    Thunderbird

    • Mac
    • Windows
    • Linux
    • BSD
    • AppImageHub
    • Snapcraft
    • Flathub
    • PortableApps.com
    • Haiku
    • Homebrew
    • Chocolatey
    93 alternatives to Thunderbird 

    Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.

     Suggest and vote on features
    Features
    1.  Extensible by Plugins/ExtensionsThunderbird can be extended with add-ons, plugins and extensions.
    2.  Multiple Account supportThunderbird support multiple accounts without the need to logout and login
    3.  Calendar IntegrationThunderbird lets you sync your tasks and events with your calendar application.
    4.  Email OrganizerThunderbird allows you to take control of your inbox by filtering and control tools.
    5.  Dark ModeThunderbird supports dark mode for comfortable usage in low light conditions.
    6.  Support for ThemesYou can use themes and templates to change the look and feel of Thunderbird.
    7.  Integrated Password ManagerThunderbird lets you access all the passwords you’ve saved across your different devices.
    8.  Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Thunderbird.
    9.  PortableThunderbird can be used from a USB stick or similar with no prior installation.
    Screenshot
    Dark Mode
    Mail Account Setup Wizard
    Thunderbird vs Microsoft Office Outlook opinions
    Most users think Thunderbird is a great alternative to Microsoft Office Outlook.
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    Guest

    Seems to be more secure than Microsoft alternatives and more easily updatable.

    Top positive comment ago
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    12
    JohnFastman

    Despite its age, Thunderbird remains the most fully featured email client out there. Various add-ons can extend its functionality, it (now) has a built in calendar and, unlike Outlook, it's free, open source and respects your privacy.

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    Guest

    The interface is just impossible for many people to use.

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    14
    s0raz

    I would rather Thunderbird over Outlook because it's open source.

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    Guest

    I transitioned all ove my computers from Windows to Linux. I had 4 computers so I used four different distributions with different linux bases, Debian and Arch. Thunderbird worked perfectly. The email client is awesome, I think they should devote more development efforts to calender and task management integration.

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    2
    sangwenobdi

    It can access email server just as outlook

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    Can202

    ThunderBird es la mejor alternativa open source, ya que puedes personalizarlo, mi recomendación es usar la extención CheckBox, Thunderbird junto a CheckBox (extensión), la mejor APP para Mail

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  2. K-9 Mail icon

    K-9 Mail

    • Android
    • Android Tablet
    • F-Droid
    45 alternatives to K-9 Mail 

    K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more.

     Suggest and vote on features
    Features
    1.  Ad-freeK-9 Mail doesn't contain any form of external advertising.
    2.  Multiple Account supportK-9 Mail support multiple accounts without the need to logout and login
    3.  Privacy focusedK-9 Mail is considered a privacy friendly alternative.
    4.  PGP EncryptionK-9 Mail supports PGP, an encryption system used for sending encrypted emails and files.
    Screenshot
    Screenshot
    Screenshot
    K-9 Mail vs Microsoft Office Outlook opinions
    Most users think K-9 Mail is a great alternative to Microsoft Office Outlook.
    JohnFastman

    Not the prettiest, but it's open source (trustworthy), free, privacy-respecting and very functional. My go-to Android email client. I cannot hesitate less in recommending it.

    Positive comment ago
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    4
    Online_Purchases1

    Deletes e-mail from the server even when underground in NYC subway. Makes life so easy to delete e-mails while on the train When surfacing, K-9 syncs with the server and POOF....those unwanted e-mails are gone from the server.

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  3. eM Client icon

    eM Client

    • Mac
    • Windows
    65 alternatives to eM Client 

    eM Client is a full featured e-mail client with a modern and easy to use interface. eM Client also offers calendar, tasks, contacts, notes and chat.

     Suggest and vote on features
    Features
    1.  Calendar IntegrationeM Client lets you sync your tasks and events with your calendar application.
    2.  Multiple Account supporteM Client support multiple accounts without the need to logout and login
    3.  PGP EncryptioneM Client supports PGP, an encryption system used for sending encrypted emails and files.
    4.  Dark ModeeM Client supports dark mode for comfortable usage in low light conditions.
    5.  Unified inboxView e-mails (or similar) from all accounts in one unified view with eM Client.
    6.  Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
    7.  Email OrganizereM Client allows you to take control of your inbox by filtering and control tools.
    8.  Sync with Google CalendareM Client can be synchronized with Google Calendar
    9.  Automatic BackupeM Client will automatically back up your data periodically.
    eM Client: Inbox view
    eM Client: Calendar - week view
    eM Client: Inbox with Agenda sidebar
    eM Client vs Microsoft Office Outlook opinions
    Most users think eM Client is a great alternative to Microsoft Office Outlook.
    Guest

    Supports 365 Shared Mailboxes.

    Top positive comment ago
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    Guest

    One of the only fully integrated email and calendar solutions that supports Office365, Exchange, Outlook, Gmail, GSuite, POP, and IMAP. Good performance and usability.

    Top positive comment ago
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    Guest

    It has all features like Outlook: tasks, calendar, mail, .... good design, ...

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    2
    hellih

    It is not very overcomplicated! Very simple, but functional design. therefore also very easy to set up and use.

    Positive comment ago
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    logicbrick

    A nicer, less cluttered version of outlook. Biggest advantage is ease of navigation and use. E.g. you can view all mail and calendars in a single combined view, without tampering with any settings. Similarly, the tasks view is also very capable. Added to this, the support team are very responsive and helpful.

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    -2
  4. Evolution icon

    Evolution

    • Linux
    • BSD
    • S/MIME
    • GNOME
    • OpenPGP
    80 alternatives to Evolution 

    Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality. Evolution supports a wide range of industry standard data formats and network protocols for information exchange, with an emphasis on...

     Suggest and vote on features
    Features
    1.  Calendar IntegrationEvolution lets you sync your tasks and events with your calendar application.
    2.  Calendar ViewEvolution has a built-in calendar view to have a clear overview of your content over time.
    3.  Multiple Account supportEvolution support multiple accounts without the need to logout and login
    4.  Sync with Google CalendarEvolution can be synchronized with Google Calendar
    5.  RemindersEvolution allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
    6.  GPG EncryptionEvolution supports GPG (aka GnuPG) for encryption of things like emails, messages, files, etc.
    7.  Spam FilterEvolution can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
    Mail
    EMail Inbox
    Calendar - Weekly View
    Evolution vs Microsoft Office Outlook opinions
    Most users think Evolution is a great alternative to Microsoft Office Outlook.
    Guest

    It runs on Linux and you still have content if you are offline.

    Top positive comment ago
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    Guest

    I've found it better than thunderbird and it can work with exchange just with one free plugin

    Top positive comment ago
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    Guest

    This would be the best alternative, except that it requires the Gnome desktop, so users of other desktop environments need to look elsewhere.

    Positive comment ago
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    Guest

    Fast and User friendly. Light-weight and classic menus really give a touch of old classic office 2003. Easy integration of mails especially exchange mails without facing any bottlenecks.

    Positive comment ago
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    Guest

    Support for EWS allows me to connect to exchange and get all the benefits like contacts and calendar I wouldn't so easily get on Thunderbird. Also it nicely integrates with the built in Ubuntu calendar as well which is a big plus.

    Positive comment ago
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  5. Mailspring icon

    Mailspring

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu
    44 alternatives to Mailspring 

    Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.

     Suggest and vote on features
    Features
    1.  Unified inboxView e-mails (or similar) from all accounts in one unified view with Mailspring.
    2.  Multiple Account supportMailspring support multiple accounts without the need to logout and login
    3.  Dark ModeMailspring supports dark mode for comfortable usage in low light conditions.
    4.  Ad-freeMailspring doesn't contain any form of external advertising.
    5.  Email OrganizerMailspring allows you to take control of your inbox by filtering and control tools.
    6.  Support for ThemesYou can use themes and templates to change the look and feel of Mailspring.
    7.  Extensible by Plugins/ExtensionsMailspring can be extended with add-ons, plugins and extensions.
    Clean design with integrated search and swipe gestures
    Built-in dark theme
    Advanced mailbox analytics
    Mailspring vs Microsoft Office Outlook opinions
    Most users think Mailspring is a great alternative to Microsoft Office Outlook.
    Guest

    Speed of work, good connection to the mail server, speed search.

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    Guest

    Beautiful theme options with custom designed themes available. I tried thunderbird a few times but always came back to mailspring. I LOVE the "views" feature that shows you how many times an email was opened and if it was forwarded by the recipient!

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  6. FairEmail icon

    FairEmail

    • Android
    • Android Tablet
    • F-Droid
    44 alternatives to FairEmail 

    FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. There are many privacy settings including encryption via OpenPGP and S/MIME and reformatted emails to avoid phishing.

     Suggest and vote on features
    Features
    1.  Privacy focusedFairEmail is considered a privacy friendly alternative.
    2.  Multiple Account supportFairEmail support multiple accounts without the need to logout and login
    3.  PGP EncryptionFairEmail supports PGP, an encryption system used for sending encrypted emails and files.
    4.  Block TrackersFairEmail has a feature to block trackers from tracking you.
    5.  Calendar IntegrationFairEmail lets you sync your tasks and events with your calendar application.
    Compose message view.
    Setup screen.
    Messages view with dark theme.
    FairEmail vs Microsoft Office Outlook opinions
    pros, cons and recent comments
    RasheedAZ

    open source, secure, regularly updated

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    1
  7. Spark Mail icon

    Spark Mail

    • Mac
    • Android
    • iPhone
    • iPad
    • Apple Watch
    • Windows
    58 alternatives to Spark Mail 

    E-mail app with all the great features: swipes (long/short), snooze, add (multiple) attachments from the cloud, support for various e-mail services and more.

     Suggest and vote on features
    Features
    1.  Multiple Account supportSpark Mail support multiple accounts without the need to logout and login
    2.  Email SchedulingYou can schedule a marketing, sales, or personal email for a time in the future with Spark Mail.
    3.  Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
    4.  Email OrganizerSpark Mail allows you to take control of your inbox by filtering and control tools.
    5.  Calendar IntegrationSpark Mail lets you sync your tasks and events with your calendar application.
    6.  Dark ModeSpark Mail supports dark mode for comfortable usage in low light conditions.
    Screenshot
    Screenshot
    Screenshot
    Spark Mail vs Microsoft Office Outlook opinions
    Most users think Spark Mail is a great alternative to Microsoft Office Outlook.
    Guest

    Nice client. Great UI. It does lack Caldav support unfortunately.

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    -1
  8. Claws Mail icon

    Claws Mail

    • Windows
    • Linux
    • BSD
    88 alternatives to Claws Mail 

    Claws Mail is an email client (and news reader), based on GTK+, featuring

    Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability.

     Suggest and vote on features
    Features
    1.  LightweightClaws Mail consumes less device resources compared to similar apps.
    2.  Extensible by Plugins/ExtensionsClaws Mail can be extended with add-ons, plugins and extensions.
    3.  Multiple Account supportClaws Mail support multiple accounts without the need to logout and login
    4.  No registration requiredYou can use most of the features in Claws Mail without registration.
    5.  Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Claws Mail.
    6.  Spam FilterClaws Mail can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
    7.  PortableClaws Mail can be used from a USB stick or similar with no prior installation.
    The main window
    The account preferences window
    Claws Mail vs Microsoft Office Outlook opinions
    pros, cons and recent comments
    Guest

    Claws Mail is email only, does not have many of the features of Outlook. Displaying HTML mail is sketchy at best.

    Negative comment ago
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    -2
  9. Geary icon

    Geary

    • Linux
    • BSD
    • GNOME
    • Flatpak
    52 alternatives to Geary 

    Geary is an email application built around conversations, for the GNOME 3 desktop.

     Suggest and vote on features
    Features
    1.  Multiple Account supportGeary support multiple accounts without the need to logout and login
    2.  Dark ModeGeary supports dark mode for comfortable usage in low light conditions.
    3.  Email OrganizerGeary allows you to take control of your inbox by filtering and control tools.
    4.  Spam FilterGeary can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
    5.  LightweightGeary consumes less device resources compared to similar apps.
    Main window
    Geary vs Microsoft Office Outlook opinions
    Most users think Geary is a great alternative to Microsoft Office Outlook.
    Guest

    Beatiful frontend Stable working Advanced features

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  10. Microsoft Mail and Calendar icon

    Microsoft Mail and Calendar

    • Windows
    • Windows S
    90 alternatives to Microsoft Mail and Calendar 

    Windows 10 has Mail and Calendar apps already built in.

     Suggest and vote on features
    Features
    1.  Unified inboxView e-mails (or similar) from all accounts in one unified view with Microsoft Mail and Calendar.
    Screenshot
    Screenshot
    Screenshot
    Microsoft Mail and Calendar vs Microsoft Office Outlook opinions
    Most users think Microsoft Mail and Calendar is a great alternative to Microsoft Office Outlook.
    coryroberts

    Really minimal functionality, does not even support Rules for Office 365 email addresses.

    Negative comment ago
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    Guest

    Bundled in win 10 and very simple to use. Great if you just read mail.

    Positive comment ago
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Showing 10 of 98 alternatives
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