Possibly the biggest improvement introduced with the upcoming service pack 2 for Exchange Server 2003 is the lifting of the 16BG store limit for the Standard version. SP2 adds a 75GB limit. This is great news for those of us in the small to medium business market.
Microsoft summarizes the SP2 and its improvements noting the release expected in the second half of 2005.
Other improvements include true push email to mobile devices and the addition of SenderID protocol support.
[Via MS Exchange Blog ]