Welcome to OpenChange
Quick Links
Download OpenChange 1.0 BORG
OpenChange 1.0 BORG is the latest release available for download. Download sources and GPG signature:
OpenChange is a portable Open Source implementation of Microsoft Exchange server and Exchange protocols. It provides a complete solution to interoperate with Microsoft Outlook clients or Microsoft Exchange servers.
OpenChange client-side library is used in existing messaging clients and is the solution in new projects to communicate natively with Microsoft Exchange and Exchange-compatible servers. OpenChange server is a transparent Microsoft Exchange server replacement using native Exchange protocols and does not require any plugin installation in Outlook.
OpenChange is a member project of the Software Freedom Conservancy.
Latest News
Easing OpenChange documentation contributions
![](/web/20130120190720im_/http://www.openchange.org/images/openchange_logo_v2.png)
Along with the explicit Creative Commons Attributation-ShareAlike 3.0
Unported License applied to the website, we have also decided to make
its source files available to the public and make our contributors
life easier.
The Sources of each page of the website are now
accessible through the View the source of this file link at the
bottom right of each page.
Samba-4.0.0 stable release and OpenChange
![](/web/20130120190720im_/http://www.openchange.org/images/samba_logo.png)
Samba 4.0.0 stable release is Available for Download!
This is a major step forward, a huge achievement and as of this afternoon, OpenChange GIT is now using this stable release as its Samba default version.