Originally Posted by aschieman
There is no way to actually "add" an Exchange server to a BES environment. The BlackBerry should be able to serve users on any server in the Exchange domain as long as the proper rights are assigned.
1. Is the new server part of the same Exchange domain?
2. Did you update the rights of the besadmin user on the new server?
3. When you look at the properties of a user in BlackBerry Manager, do they reflect the new server?
Absolutely. 1 is obvious but important, but I suspect 2 or permissions is the culprit. However you give your besadmin account access to your exchange servers, you need to do this for the new server.
If not that, it is probably the sendas issue which is created/restarted by the DST patches. If the above doesn't work, search for sendas in the DST Upgrade