travis' brain dump

So, I spent quite a bit of time digging around on the internet and came up with no solution to this issue. So I’m posting the solution to this one. I ran across this one while moving a mailbox from one site to another physically across a WAN. Moving mailboxes on the server from one datastore to the other worked just fine, however every time I ran a mailbox move from one location to another, it bombed out with the following error:

[5/10/2010 6:57:36 PM] [0] [ERROR] Error was found for Test User (test.user@testdomain.com) because: Error occurred in the step: Moving messages. Unable to unlock mailbox with error:
MAPI or an unspecified service provider.
ID no: 00000000-0000-00000000, error code: -1056749254
[5/10/2010 6:57:36 PM] [0] [06876] The operation has finished.

One might immediate think there is an issue with permissions since this was a common item found when doing a search on this particular error and showed up most often when doing a migration from Exchange 2003 to Exchange 2007. In this particular instance, it is due to a problem with a WAN accelerator.

The best way to confirm this is to complete a dump on the interface on the source and target exchange servers when conducting the move. If the WAN accelerator is interfering it may manifest itself by showing a packet on source side that differs from the expected packet on the target side.

In this case, it was a transparency mode configured on a RiverBed device.

Hopefully this post will help someone keep from smashing their head into a keyboard for a couple of days since they can’t find the answer and point them in the right direction. 🙂