Sorted out ....
Excellent .... it was down to the UnRead Marks not replicating between the servers. Configured this for all the mail files, and it working perfectly.
amukhey - the actual Domino upgrades are not within my scope, so it will be handled by a different team, who do this all the time. The BES was a requirement, and they didn't want to have to upgrade the server again afterwards!
Many thanks for all the help
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