I upgraded Exchange 2003 to 2010 about 3 weeks ago.
The upgrade is done according to whitepapers from Microsoft.
Everything is working very well, except one little thing;
Outlook-clients (Outlook 2007/2010) cannot download the "Offline Address Book" from the new server.
When manually initiating the download it just hangs there.. "Preparing to send/receive"
Thank you all in advance! :-)