We are trying to migrate our BES 4.x server to our new domain without re-activation of the handsets if possible.
BES Server is in the old domain, BESAdmin account is in the old domain, but all Exchange 2003 users are in the new domain (trust in place). BES using local install of SQL 2000.
Could we ADMT the BESAdmin account to the new domain and change the BES servers domain membership?
Domains are not the issue for BlackBerry / Exchange. Exchange Organizations are the limit. If you haven't created a new Exchange Organization and simply just moved servers to a different domain then you don't need to worry.
If you're using the ADMT and have multiple forests in place you're out of luck.