Quote:
Originally Posted by rsenio
Follow the migration steps accordingly. Make sure that mailflow is working between your 2010 and 2003 servers. Don't move any of your BES users right off the hop. Instead move a low impact Exchange user (non BES user), or create an account for testing Exchange 2010-2003 mail flow.
Once mail is flowing correctly between versions, route incoming mail into the 2010 HT server first rather than the 2003 box. Test.
If you feel comfortable with your configuration follow the document as suggested EXACTLY. KB22601-How to migrate the BlackBerry Enterprise Server 5.0 from Microsoft Exchange Server 2003 or 2007 to Microsoft Exchange Server 2010
I went from Exchange 2007 to 2010, no downtime. But I followed the document exactly. And yes the BesAdmin account must be done first.
Side note, if your going to update Exchange 2010 to SP1 /SP1 RU1 prior to doing the migrations, task 6 of the document is no longer correct. "Increase the maximum number of connections to the Address Book service."
Follow the directions here to complete this step. Exchange 2010 SP1 and Blackberry Enterprise Server (BES) | Elan Shudnow's Blog
Remember, take it one step at a time and TEST TEST TEST
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We've followed the steps. Mailflow is working between 2003 and 2010...except you can't send from a 2010 blackberry to 2003. I can send from that same account through OWA from 2010 to 2003 with no problems.