Perms or corruption. I am a little confused from your OP as to what state each server is in right now but if you are back on OLDBES make sure services are stopped on NEWBES.
I would forget NEWBES for now and see what has changed on OLDBES. You are doing all this as besadmin aren't you?
Can we have some versions and mail server info pls.....
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I was a BES and Exchange admin once.
Then my world turned Blue.
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