Has anyone performed this migration following these steps? We are highly concerned about moving the BESAdmin mailbox first. We want to make sure that it will not cause the users with blackberries who still have their mailboxes on the Exchange 2003 server to stop working. We don't want to suddenly be forced to move everyone to the new server in a panic, or try to figure out if we can move the BESAdmin mailbox back and have it work again. We only have a single domain, single exchange organization. BES 5.0.2 is working fine with Exchange 2003 and now we have setup a new Exchange 2010 server and just want to move people over. Extended blackberry downtime or having to reactivate devices is not acceptable.
Can anyone provide some input about their experiences? Thanks for any help.
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