Notes Sametime on Exchange

Hello,

I have a Domino Sametime Server running 8.5.1 and we are in a transition mode to Exchange.

The recommendation is to have the mails migrated onto Exchange 2007, but retain the Sametime Server running on Notes. Is this feasible and if so would appreciate any documentation of this. Please Note that the SMTP would be migrated onto the HUB server on exchange.

Thanks for your inputs

rajveeken