Microsoft Outlook AlternativesOnly apps categorised as Calendar Apps

Alternatives list

1. 

   

   Thunderbird

    2625 likes

   Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.

   99 Thunderbird alternatives

   Cost / License

   • Free
   • Open Source (MPL-2.0)

   Application typeApplication types

   • Email Client
   • Calendar

   Origin

   • United States

   Platforms

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

   • United States

   

   

   

   +8

   

   More about Thunderbird  

   

   Good alternative?Is Thunderbird a good alternative to Microsoft Outlook?

    

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   17comments

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   Thunderbird vs Microsoft Outlook Comments

   Top Positive Comment by John Fastman · Jan 1, 2017

   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 Negative Comment by Guest · Aug 5, 2020

   The interface is just impossible for many people to use.

   Negative comment by Guest · May 11, 2026

   First, it does allow you to connect Zoom for meetings. Second, support is slow or provides little information.

   3 of 17 comments

   

   

   • Thunderbird is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
   • Thunderbird is Customizable and Privacy focusedMicrosoft Outlook is not according to our users
2. 

   

   Evolution

    212 likes

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

   76 Evolution alternatives

   Cost / License

   • Free
   • Open Source (LGPL-2.1)

   Application typeApplication types

   • Email Client
   • Calendar

   Origin

   • United States

   Platforms

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

   • United States

   

   

   

   +4

   

   More about Evolution  

   

   Good alternative?Is Evolution a good alternative to Microsoft Outlook?

    

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   6comments

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   Evolution vs Microsoft Outlook Comments

   Top Positive Comment by Guest · Sep 9, 2018

   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 by gifford · Sep 29, 2025

   I can just find everything instantly, Outlook I'm having to go to Chat GPT to research where the option is hidden!

   Positive comment by Guest · Nov 7, 2021

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

   3 of 6 comments

   

   

   • Evolution is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
4. 

   

   Betterbird

    89 likes

   Betterbird, a soft fork of Mozilla Thunderbird, improves user experience with advanced features, bug fixes, security patches, and multi-row descriptions similar to Outlook. Compatible with multiple platforms and can be used alongside Thunderbird, sharing the same profile.

   39 Betterbird alternatives

   Cost / License

   • Free
   • Open Source

   Application type

   • Email Client

   Origin

   • Germany
   • EU

   Platforms

   • Mac
   • Windows
   • Linux
   • Flathub
   • Chocolatey

   • Germany
   • EU

   

   

   

   +9

   

   More about Betterbird  

   

   Good alternative?Is Betterbird a good alternative to Microsoft Outlook?

    
5. 

   

   Spark Mail

    144 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.

   73 Spark Mail alternatives

   Cost / License

   • Freemium
   • Proprietary

   Application typeApplication types

   • Email Client
   • Calendar

   Origin

   • Ukraine

   Platforms

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

   • Ukraine

   

   

   

   +3

   

   More about Spark Mail  

   

   Good alternative?Is Spark Mail a good alternative to Microsoft Outlook?

    

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   1comment

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   Spark Mail vs Microsoft Outlook Comments

   Positive comment by Guest · Jan 25, 2020

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

   1 of 1 comments

   

   

   • Spark Mail is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
6. 

   

   eM Client

    236 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.

   69 eM Client alternatives

   Cost / License

   • Freemium
   • Proprietary

   Application typeApplication types

   • Email Client
   • Calendar

   Origin

   • Czechia
   • EU

   Platforms

   • Mac
   • Windows
   • Android

   • Czechia
   • EU

   

   

   

   +5

   

   More about eM Client  

   

   Good alternative?Is eM Client a good alternative to Microsoft Outlook?

    

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   5comments

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   eM Client vs Microsoft Outlook Comments

   Top Positive Comment by hellih · Nov 24, 2019

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

   Positive comment by Guest · Aug 29, 2021

   Supports 365 Shared Mailboxes.

   Positive comment by Guest · Jun 16, 2020

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

   3 of 5 comments

   

   

   • eM Client is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
8. 

   

   Claws Mail

    105 likes

   Email and news client on GTK+ foundation featuring quick performance, extensible plugins, secure protocols, advanced filtering, strong folder and contact management, lightweight design, powerful search, customizable interface, multi-language support, and encryption.

   72 Claws Mail alternatives

   Cost / License

   • Free
   • Open Source

   Application typeApplication types

   • Email Client
   • Calendar

   Platforms

   • Windows
   • Linux
   • BSD

   

   

   More about Claws Mail  

   

   Good alternative?Is Claws Mail a good alternative to Microsoft Outlook?

    

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   1comment

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   Claws Mail vs Microsoft Outlook Comments

   Negative comment by Guest · Jan 18, 2020

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

   1 of 1 comments

   

   

   • Claws Mail is Free and Open SourceMicrosoft Outlook is Paid and Proprietary
   • Claws Mail is Lightweight, Customizable and Privacy focusedMicrosoft Outlook is not according to our users
9. 

   

   EssentialPIM

    78 likes

   The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions.

   180 EssentialPIM alternatives

   Cost / License

   • Freemium
   • Proprietary

   Application typeApplication types

   • Todo List Manager
   • Task Management

   Origin

   • Estonia
   • EU

   Platforms

   • Windows
   • Android
   • iPhone

   • Estonia
   • EU

   

   

   

   +9

   

   More about EssentialPIM  

   

   Good alternative?Is EssentialPIM a good alternative to Microsoft Outlook?

    

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   1comment

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   EssentialPIM vs Microsoft Outlook Comments

   Positive comment by Guest · Dec 13, 2016

   Tricky to configure. Does not speak MAPI, but many Cloudservices. I was not successful to synchronize OwnCloud

   1 of 1 comments

   

   

   • EssentialPIM is Freemium and ProprietaryMicrosoft Outlook is Paid and Proprietary
   • EssentialPIM is a Todo List Manager Microsoft Outlook is an Email Client
10. 

    

    Canary Mail

     29 likes

    Secure email app for Mac, iPhone, Android and Windows with AI Copilot, PGP encryption, read receipts and one unified inbox.

    72 Canary Mail alternatives

    Cost / License

    • Freemium
    • Proprietary

    Application type

    • Email Client

    Origin

    • Singapore

    Platforms

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

    • Singapore

    

    

    

    +9

    

    More about Canary Mail  

    

    Good alternative?Is Canary Mail a good alternative to Microsoft Outlook?

     
11. 

    

    Kontact

     37 likes

    Personal Information Manager (Mail, Contact, Calendar and more).

    Cost / License

    • Free
    • Open Source

    Application typeApplication types

    • Calendar
    • Email Client

    Origin

    • Germany
    • EU

    Platforms

    • Linux
    • Flathub

    • Germany
    • EU

    

    More about Kontact  

    

    Good alternative?Is Kontact a good alternative to Microsoft Outlook?

     
12. 

    

    BlueMail

     34 likes

    BlueMail is a modern, mobile first, powerful Email management tool with a sleek design, unified inbox and support for all your accounts: IMAP,Exchange,POP3.

    43 BlueMail alternatives

    Cost / License

    • Free Personal
    • Proprietary

    Application typeApplication types

    • Email Client
    • Calendar

    Origin

    • United States

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Apple Watch
    • HUAWEI AppGallery

    • United States

    

    

    

    +9

    

    More about BlueMail  

    

    Good alternative?Is BlueMail a good alternative to Microsoft Outlook?

     

    |

    1comment

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    BlueMail vs Microsoft Outlook Comments

    Positive comment by rstefan · Sep 11, 2020

    much lighter, faster more responsive than outlook both in windows and Android. vivid and vibrant colors and ergonomic menu

    1 of 1 comments

    

    

    • BlueMail is Free Personal and ProprietaryMicrosoft Outlook is Paid and Proprietary
    • BlueMail is Lightweight and Privacy focusedMicrosoft Outlook is not according to our users
13. 

    

    Apple Calendar

     147 likes

    Keep track of your busy schedule and share it with others using Calendar. Create separate calendars — one for home, another for school, a third for work, and so on. See all your calendars in a single window or choose to see only the calendars you want.

    134 Apple Calendar alternatives

    Cost / License

    • Free
    • Proprietary

    Application type

    • Calendar

    Origin

    • United States

    Platforms

    • Mac
    • iPhone
    • iPad
    • iCloud

    • United States

    

    

    

    +1

    

    More about Apple Calendar  

    

    Good alternative?Is Apple Calendar a good alternative to Microsoft Outlook?

     

    |

    5comments

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    Apple Calendar vs Microsoft Outlook Comments

    Top Negative Comment by Guest · Sep 18, 2019

    it's a calendar app not a email client!

    Negative comment by Guest · Dec 19, 2019

    Apple Calendar is a Calendar. It's a minimal part of what Outlook mail client provides.

    Negative comment by Guest · Dec 14, 2018

    outlook its not just calendar

    3 of 5 comments

    

    

    • Apple Calendar is Free and ProprietaryMicrosoft Outlook is Paid and Proprietary
    • Apple Calendar is a Calendar Microsoft Outlook is an Email Client
14. 

    

    Zimbra Desktop

     32 likes

    The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road.

    58 Zimbra Desktop alternatives

    Cost / License

    • Free Personal
    • Proprietary

    Application typeApplication types

    • Email Client
    • Calendar

    Origin

    • United States

    Platforms

    • Mac
    • Windows
    • Linux

    • United States

    

    

    

    +3

    

    More about Zimbra Desktop  

    

    Good alternative?Is Zimbra Desktop a good alternative to Microsoft Outlook?