Open Source Microsoft Mail and Calendar AlternativesEmail Clients & Calendar Apps like Microsoft Mail and Calendar

Alternatives list

1. 

   

   Thunderbird

    2522 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.

   87 Thunderbird alternatives

   Cost / License

   • Free
   • Open Source

   Application types

   • Email Client
   • Calendar App

   Origin

   • United States

   Platforms

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

   

   

   

   +8

   

   More about Thunderbird  

   

   Is Thunderbird a good alternative to Microsoft Mail and Calendar?

    

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   5comments

   15users say it's a good alternative

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   Comments about Thunderbird as an Alternative to Microsoft Mail and Calendar

    

   Top Positive Comment

   Kelson V

   Oct 14, 2023

   0

   Thunderbird's more stable in my experience, certainly more capable, the 2023 UI update has improved matters quite a bit, plus I had a much easier time tying it to my Nextcloud calendar and contacts. It's a bit heavier, but that's balanced out by the other benefits. Plus Thunderbird will also run on other platforms.

   Top Negative Comment

   SWMANNN

   Jun 13, 2022

   2

   It is just too big, has a steeper learning curb, and bloated for the user population that MS M&C targets. It rather is an alternative to MS Outlook.

   Guest

   Negative comment•Nov 25, 2020

   3

   We need to open it to receive emails. I t cannot run in baground.

   Review by a new / low-activity user.

   Show more comments

   3 of 5 comments

   

   

   • Most users think Thunderbird is a great Microsoft Mail and Calendar alternative.

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

   • Thunderbird is the most popular Open Source & free alternative to Microsoft Mail and Calendar.

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

   

   Betterbird

    70 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.

   28 Betterbird alternatives

   Cost / License

   • Free
   • Open Source

   Application type

   • Email Client

   Origin

   • Germany
   • EU

   Platforms

   • Mac
   • Windows
   • Linux
   • Flathub
   • Chocolatey

   

   

   

   +9

   

   More about Betterbird  

   

   Is Betterbird a good alternative to Microsoft Mail and Calendar?

    
4. 

   

   Fossify Calendar

    47 likes

   Your privacy-aware, open-source calendar with intuitive design and multi-platform syncing.

   50 Fossify Calendar alternatives

   Cost / License

   • Free
   • Open Source

   Application type

   • Calendar App

   Origin

   • India

   Platforms

   • Android
   • Android Tablet
   • F-Droid

   

   

   

   More about Fossify Calendar  

   

   Is Fossify Calendar a good alternative to Microsoft Mail and Calendar?

    
5. 

   

   Evolution

    205 likes

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

   69 Evolution alternatives

   Cost / License

   • Free
   • Open Source

   Application types

   • Email Client
   • Calendar App

   Origin

   • United States

   Platforms

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

   

   

   

   +4

   

   More about Evolution  

   

   Is Evolution a good alternative to Microsoft Mail and Calendar?

    

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   1comment

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   Comments about Evolution as an Alternative to Microsoft Mail and Calendar

    

   SWMANNN

   Negative comment•Jun 13, 2022

   1

   Can't replace MS M&C since it doesn't support Windows

   

   

   • Evolution is Free and Open SourceMicrosoft Mail and Calendar is Free and Proprietary
6. 

   

   SeaMonkey

    241 likes

   Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing in one application. Itis built on the open source Mozilla Gecko engine, the same code which underlies Thunderbird and is the base for the Firefox browser.

   185 SeaMonkey alternatives

   Cost / License

   • Free
   • Open Source

   Application type

   • Web Browser

   Origin

   • United States

   Platforms

   • Mac
   • Windows
   • Linux
   • BSD
   • PortableApps.com

   

   

   

   +3

   

   More about SeaMonkey  

   

   Is SeaMonkey a good alternative to Microsoft Mail and Calendar?

    
7. 

   

   Claws Mail

    106 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.

   62 Claws Mail alternatives

   Cost / License

   • Free
   • Open Source

   Application types

   • Email Client
   • Calendar App

   Platforms

   • Windows
   • Linux
   • BSD

   

   

   More about Claws Mail  

   

   Is Claws Mail a good alternative to Microsoft Mail and Calendar?

    
9. 

   

   Geary

    105 likes

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

   46 Geary alternatives

   Cost / License

   • Free
   • Open Source

   Application type

   • Email Client

   Origin

   • United States

   Platforms

   • Linux
   • BSD
   • Flathub
   • GNOME
   • Flatpak

   

   More about Geary  

   

   Is Geary a good alternative to Microsoft Mail and Calendar?

    

   |

   1comment

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   Comments about Geary as an Alternative to Microsoft Mail and Calendar

    

   Ferociter

   Negative comment•Oct 1, 2024

   0

   The closest to Windows Mail and Calendar; yet doesn't support windows.

   

   

   • Geary is Free and Open SourceMicrosoft Mail and Calendar is Free and Proprietary
   • Geary is Lightweight and Privacy focusedMicrosoft Mail and Calendar is not according to our users
10. 

    

    Mailpile

     117 likes

    Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is funded by a large community of backers and all code related to the project is and will be released under an OSI approved Free Software license.

    59 Mailpile alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    • Email Client
    • WebMail Provider

    Alerts

    • Discontinued

    Platforms

    • Linux
    • Online
    • Self-Hosted
    • OpenPGP

    

    

    More about Mailpile  

    

    Is Mailpile a good alternative to Microsoft Mail and Calendar?

     

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    • Mailpile is the most popular Self-Hosted alternative to Microsoft Mail and Calendar.

    • Mailpile is Free and Open SourceMicrosoft Mail and Calendar is Free and Proprietary
11. 

    

    Wino Mail

     8 likes

    Wino is a lightweight native mail client for Windows 10/11. It is still in active development. Main motivation for this project is to replace Mail & Calendar for Windows with modern Windows design without using web technologies for speed.

    21 Wino Mail alternatives

    Cost / License

    • Freemium (Pay once)
    • Open Source

    Application type

    • Email Client

    Origin

    • Türkiye

    Platforms

    • Windows

    

    

    

    +2

    

    More about Wino Mail  

    

    Is Wino Mail a good alternative to Microsoft Mail and Calendar?

     

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    1comment

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    Comments about Wino Mail as an Alternative to Microsoft Mail and Calendar

     

    stepgray4

    Positive comment•Nov 7, 2023

    0

    Clearly designed from Windows Mail and Calendar, it has a very simple and easy to use interface, making it ideal to replace Windows Mail.

    Review by a new / low-activity user.

    

    

    • Wino Mail is Freemium and Open SourceMicrosoft Mail and Calendar is Free and Proprietary
    • Wino Mail is LightweightMicrosoft Mail and Calendar is not according to our users
12. 

    

    Right Calendar

     9 likes

    Right Calendar app is a versatile scheduling tool that offers unparalleled flexibility to its users. One of its standout features is that it is built on an open-source platform. This not only ensures transparency but also allows for constant updates and bug fixes from a...

    Cost / License

    • Free Personal
    • Open Source

    Application type

    • Calendar App

    Origin

    • International

    Platforms

    • Android

    

    

    

    More about Right Calendar  

    

    Is Right Calendar a good alternative to Microsoft Mail and Calendar?

     
13. 

    

    Kontact

     38 likes

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

    108 Kontact alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    • Calendar App
    • Email Client

    Origin

    • Germany
    • EU

    Platforms

    • Linux
    • Flathub

    

    More about Kontact  

    

    Is Kontact a good alternative to Microsoft Mail and Calendar?

     
14. 

    

    KMail

     49 likes

    KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.

    52 KMail alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    • Email Client

    Origin

    • Germany
    • EU

    Platforms

    • Linux
    • BSD

    

    More about KMail  

    

    Is KMail a good alternative to Microsoft Mail and Calendar?