add support for Exchange Active Sync for mobile devices
you can look at a working implementation at tine20.org - but they use AGPL as license. If patent restrictions apply, you could use geo ip filter to not allow this for U.S. users...
This would allow users of windows phone, webos, android and all those 'enterprise guys' to sync... great!
This idea is a duplicate and tracked under the following two main ideas:
ActiveSync support for mobile devices:
http://fruux.uservoice.com/forums/153774-general/suggestions/2793139-sync-with-exchange-servers-add-activesync-suppor
Sync with Exchange servers:
http://fruux.uservoice.com/forums/153774-general/suggestions/2820044-sync-with-microsoft-exchange-server
Please add your votes there, if you’d like to see the feature in a future version of fruux.