554 5.2.0 STOREDRV.Deliver.Exception:NotSupp ortedWithServerVersionException

Hi

Currently migrating Exchange 2010 to 2013. Randomly receiving this bounce message.

Remote Server returned '554 5.2.0 STOREDRV.Deliver.Exception:NotSupportedWithServerVersionException; Failed to process message due to a permanent exception with message The mailbox of user xxx@yyy.com that is located on a server that is running version 14 can't be opened on a server that is running version 15. 

Any idea what may be causing this?

Thanks

June 18th, 2015 3:06am

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