Exchange 2003 Service Pack 2
Below are several links for Exchange 2003 SP2 information. To increase the 16 Gig limit for the Exchange Standard Edition Information Store, you need to perform a registry hack. There were also changes for mobile users, IMF and other Exchange 2003 features.
Original Post: http://blogs.technet.com/klince/archive/2005/11/27/415155.aspx
You'll definitely want to check out the current release notes:
http://go.microsoft.com/fwlink/?LinkId=52072
If you dig into the release notes and search for "enabling or disabling MAPI access per user" you'll find the details on how to force cached mode access to Exchange 2003.
Here's some detail on how to increase the store size to >16GB:
http://blogs.technet.com/exchange/archive/2005/09/14/410821.aspx
http://www.petri.co.il/change_store_size_limits_ex2003_sp2.htm
In addition - here's some detail on Windows Mobile 5:
http://www.microsoft.com/windowsmobile/5/default.mspx
To take advantage of the new security features and the AUTD push to the device, you'll need WM5 devices that are running the MFP (Mobility Feature Pack). The MFP is loaded by the OEM on the phone.
The web based 'remote wipe' admin console and the utlity to deploy certificates to WM5 devices (to support certificate based authentication) will be available in a web rollup later this year. I'll post more details once that is available.

