[cisco-voip] unity Connection - Single Inbox on two Exchange server versions

[Jefflin Choi]

Hi All,

We have unity connection 8.5 currently integrated in exchange 2007 and
is working.
We however plan to migrate users on Exchange 2010 one by one and will
do it on parallel.

Emails are working when sending 2007 to 2010 and vice versa however we
couldn't have the single inbox functionality work.

The Unified Messaging Service  ->Exchange Server is pointed to
exchange 2007. Single inbox worked.
The Unified Messaging Service  ->Exchange Server is pointed to
exchange 2010. Single inbox worked.

Any suggestion how we could have the two servers work in parallel to
each other and have the single inbox functioning?
Anyone had done this before?

regards,
Jeff