The Best Microsoft Outlook AlternativesTop Email Clients & Calendar Apps like Microsoft Outlook

Microsoft Outlook is described as 'Manage emails, calendars, contacts, and tasks with an intuitive interface. Features smart inbox, file management, and third-party app integration' and is a very popular Email Client in the office & productivity category. There are more than 100 alternatives to Microsoft Outlook for a variety of platforms, including Windows, Mac, Linux, iPhone and Android apps. The best Microsoft Outlook alternative is Thunderbird, which is both free and Open Source. Other great apps like Microsoft Outlook are K-9 Mail, Evolution, eM Client and Mailbird.

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Microsoft Outlook alternatives are mainly Email Clients but may also be Calendar Apps or Todo List Managers.  Other popular filters includes Windows + Free and Windows + Open Source. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Microsoft Outlook.
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Manage emails, calendars, contacts, and tasks with an intuitive interface. Features smart inbox, file management, and third-party app integration.

More about Microsoft Outlook
Microsoft Outlook alternatives page was last updated Feb 8, 2025
    Mailbird icon
    Mailbird icon

    Mailbird

    Sponsored

    Streamline your email experience by managing multiple accounts, integrating apps like Slack and Google Calendar, and using AI-driven features like drafting and spam prevention. Customize your workspace with themes, notifications, and tools for improved productivity and a modern interface.

    64 Mailbird alternatives
    Mailbird screenshot 1

    License model

    • FreemiumProprietary

    Application type

    Platforms

    • Mac
    • Windows
  1. Thunderbird icon
     2412 likes

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

    86 Thunderbird alternatives
    Thunderbird screenshot 1

    License model

    • FreeOpen Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • BSD
    • AppImageHub
    • Snapcraft
    • Flathub
    • PortableApps.com
    • Haiku
    • Homebrew
    • Chocolatey
    • F-Droid

    Properties

    1.  Customizable

    Features

    1.  Extensible by Plugins/Extensions
    2.  Multiple Account support
    3.  IMAP Support
    4.  Calendar Integration
    5.  SMTP Support
    6.  Email Organizer
    7.  Add-ons
    8.  Built-in RSS reader
    9.  POP3 Support
    10.  Graphical User Interface
    11.  Dark Mode
    12. Google Calendar icon  Google Calendar integration
    Thunderbird iconMicrosoft Outlook Icon

    Thunderbird VS Microsoft Outlook

    Is Thunderbird a good alternative to Microsoft Outlook?
     
    Comments about Thunderbird as an Alternative to Microsoft Outlook
     
       
    Comment summary: Thunderbird is praised for being a strong open-source alternative to Microsoft Outlook, with numerous extensions enhancing its functionality. Users value its seamless compatibility across different Linux distributions and appreciate the built-in calendar, though some desire further improvements in calendar integration. Many find Thunderbird intuitive and easier to use than Outlook, though a minority consider its interface complicated. Security and customization are notable advantages.
    John Fastman

    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.

    Top positive commentJan 1, 2017
    12
    Guest

    The interface is just impossible for many people to use.

    Top negative commentAug 5, 2020
    16
    Shaz Shah

    I remember when I first used Thunderbird, many years ago, as I'd rather have a single interface for productivity. But the interface through me off and I never got on with the editor. Coming back to it now, it's fresher and smoother. Absolutely love it. In my opinion this is the only true alternative to Outlook. Then there's the bonus of extensions to further enhance it. Though, I'd like to see further improvements to the calendar integration.

    Positive commentMay 31, 2024
    0
    Show more comments
    3 of 15 comments
    Microsoft Outlook Icon
    Thunderbird icon
    • Most users think Thunderbird is a great Microsoft Outlook alternative.

    • Thunderbird is the most popular Windows, Android, Mac & Linux alternative to Microsoft Outlook.

    • Thunderbird is the most popular Open Source & free alternative to Microsoft Outlook.

    • Thunderbird is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
    • Thunderbird is CustomizableMicrosoft Outlook is not according to our users
  2. K-9 Mail icon
     345 likes

    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.

    43 K-9 Mail alternatives
    K-9 Mail screenshot 1

    License model

    • FreeOpen Source

    Application type

    Platforms

    • Android
    • Android Tablet
    • F-Droid

    Properties

    1.  Configurable
    2.  Privacy focused
    3.  Lightweight

    Features

    1.  Ad-free
    2.  IMAP Support
    3.  Multiple Account support
    4.  POP3 Support
    5.  One view multiple accounts
    6.  PGP Encryption
    7.  Unified inbox
    8.  No Tracking
    9.  End-to-End Encryption
    10.  Contacts
    11.  Works Offline
    12.  Dark Mode
    K-9 Mail iconMicrosoft Outlook Icon

    K-9 Mail VS Microsoft Outlook

    Is K-9 Mail a good alternative to Microsoft Outlook?
     
    Comments about K-9 Mail as an Alternative to Microsoft Outlook
     
    John Fastman

    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 commentJan 10, 2017
    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.

    Positive commentFeb 22, 2017
    1
    Microsoft Outlook Icon
    K-9 Mail icon
    • Most users think K-9 Mail is a great Microsoft Outlook alternative.

    • K-9 Mail is the most popular Android Tablet alternative to Microsoft Outlook.

    • K-9 Mail is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
    • K-9 Mail is Privacy focused and LightweightMicrosoft Outlook is not according to our users
  3. Evolution icon
     201 likes

    Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.

    76 Evolution alternatives
    Mail

    License model

    • FreeOpen Source

    Application types

    Platforms

    • Linux
    • BSD
    • Flathub
    • S/MIME
    • GNOME
    • OpenPGP

    Top Evolution Features

    1.  Calendar Integration
    2.  Contacts
    3.  CalDAV Support
    4.  Calendar View
    5.  Ad-free
    6.  Spam Filter
    7.  Multiple Account support
    8. Google Calendar icon  Sync with Google Calendar
    9.  Extensible by Plugins/Extensions
    10.  Dark Mode
    11.  Works Offline
    12.  GPG Encryption
    Evolution iconMicrosoft Outlook Icon

    Evolution VS Microsoft Outlook

    Is Evolution a good alternative to Microsoft Outlook?
     
    Comments about Evolution as an Alternative to Microsoft Outlook
     
       
    Guest

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

    Top positive commentNov 7, 2021
    2
    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 commentJan 18, 2020
    -1
    Guest

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

    Positive commentJan 17, 2020
    0
    Show more comments
    3 of 5 comments
    Microsoft Outlook Icon
    Evolution icon
    • Most users think Evolution is a great Microsoft Outlook alternative.

    • Evolution is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
  4. eM Client icon
     226 likes

    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.

    63 eM Client alternatives
    eM Client: Inbox view

    License model

    • FreemiumProprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Android

    Top eM Client Features

    1.  IMAP Support
    2.  Calendar Integration
    3.  Multiple Account support
    4.  PGP Encryption
    5.  Dark Mode
    6.  Exchange
    7.  Unified inbox
    8.  Cloud Sync
    9.  Email Organizer
    10. Google Calendar icon  Sync with Google Calendar
    11.  Automatic Backup
    12.  CardDAV Support
    eM Client iconMicrosoft Outlook Icon

    eM Client VS Microsoft Outlook

    Is eM Client a good alternative to Microsoft Outlook?
     
    Comments about eM Client as an Alternative to Microsoft Outlook
     
       
    hellih

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

    Top positive commentNov 24, 2019
    0
    Guest

    Supports 365 Shared Mailboxes.

    Positive commentAug 29, 2021
    0
    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.

    Positive commentJun 16, 2020
    1
    Show more comments
    3 of 5 comments
    Microsoft Outlook Icon
    eM Client icon
    • Most users think eM Client is a great Microsoft Outlook alternative.

    • eM Client is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  5. Mailbird icon
     304 likes

    Streamline your email experience by managing multiple accounts, integrating apps like Slack and Google Calendar, and using AI-driven features like drafting and spam prevention. Customize your workspace with themes, notifications, and tools for improved productivity and a modern interface.

    64 Mailbird alternatives
    Mailbird screenshot 1

    License model

    • FreemiumProprietary

    Application type

    Platforms

    • Mac
    • Windows

    Properties

    1.  Clean design

    Features

    1.  Sync Contacts
    2.  Dark Mode
    3.  Undo send
    4.  Email tracking
    5.  Unified inbox
    6.  GSuite Integration
    7. Slack icon  Slack integration
    8.  Multiple Account support
    9. Asana icon  Asana integration
    10.  Email template editor
    11.  Email Organizer
    12.  Spam Filter
    Mailbird iconMicrosoft Outlook Icon

    Mailbird VS Microsoft Outlook

    Is Mailbird a good alternative to Microsoft Outlook?
     
    Comments about Mailbird as an Alternative to Microsoft Outlook
     
    Guest

    Not enough functionality. No smart attachment feature, no quick sort by address or flags or attachments etc. Not really a business email client

    Negative commentNov 30, 2018
    -1
    Guest

    These are email clients not replacements for outlook

    Negative commentMay 9, 2019
    -10
    Microsoft Outlook Icon
    Mailbird icon
    • Most users think Mailbird is a great Microsoft Outlook alternative.

    • Mailbird is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  6. Spark Mail icon
     124 likes

    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.

    63 Spark Mail alternatives
    Spark Mail screenshot 1

    License model

    • FreemiumProprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Android
    • iPhone
    • iPad
    • Apple Watch

    Top Spark Mail Features

    1.  Multiple Account support
    2.  Email Scheduling
    3.  Snooze Mail
    4.  Cloud Sync
    5.  Calendar Integration
    6.  Dark Mode
    7.  Email Organizer
    8.  Unified inbox
    9.  Works Offline
    10.  Mail Filtering
    11.  Ad-free
    12. Google Calendar icon  Sync with Google Calendar
    Spark Mail iconMicrosoft Outlook Icon

    Spark Mail VS Microsoft Outlook

    Is Spark Mail a good alternative to Microsoft Outlook?
     
    Comments about Spark Mail as an Alternative to Microsoft Outlook
     
    Guest

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

    Positive commentJan 25, 2020
    -1
    Microsoft Outlook Icon
    Spark Mail icon
    • Most users think Spark Mail is a great Microsoft Outlook alternative.

    • Spark Mail is the most popular iPhone & iPad alternative to Microsoft Outlook.

    • Spark Mail is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
  7. Mailspring icon
     105 likes

    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.

    41 Mailspring alternatives
    Clean design with integrated search and swipe gestures

    License model

    • FreemiumOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu

    Properties

    1.  Support for Themes
    2.  Customizable

    Features

    1.  Unified inbox
    2.  Multiple Account support
    3.  Dark Mode
    4.  Email tracking
    5.  Snooze Mail
    6.  Ad-free
    7.  Theme Customization
    8.  Built-in translation
    9.  Email Organizer
    10.  Built-in themes
    11.  Extensible by Plugins/Extensions
    12.  Auto Update
    Mailspring iconMicrosoft Outlook Icon

    Mailspring VS Microsoft Outlook

    Is Mailspring a good alternative to Microsoft Outlook?
     
    Comments about Mailspring as an Alternative to Microsoft Outlook
     
    Paul

    Since Thunderbird is still bloated and overcomplicated for me on Linux, I'm using Mailspring for the moment. It's good, the interface is nice and it has plenty of features.

    Positive commentFeb 7, 2023
    0
    Guest

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

    Positive commentJun 12, 2021
    0
    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!

    Positive commentJul 3, 2019
    0
    Microsoft Outlook Icon
    Mailspring icon
    • Most users think Mailspring is a great Microsoft Outlook alternative.

    • Mailspring is Freemium and Open SourceMicrosoft Outlook is Paid and Proprietary
    • Mailspring is CustomizableMicrosoft Outlook is not according to our users
8 of 135 Microsoft Outlook alternatives