CalDAV and CardDAV support
By supporting CalDAV and CardDAV, it will make things easier to jump from other phones. Other cloud services support these two technologies, so being able to support these on the phones will allow customers to switch as easily as possible.
Andrew Berezovskiy commented
Or better: vote for both this suggestion and the other at
There's already another post with the same feature. Please vote there instead.
Agreed. This will also prevent Google from screwing Microsoft over by dropping EAS support in Gmail.