I have the Small Business Edition running off a separate server alongside Exchange 2007 and there have been a few issues with the current setup- especially syncing deleted mail. Also, some new users are not getting activated by receiving a "Server Busy" kind of message.

So I'm wondering if its worth just ditching this server and directly installing the Professional on the Exchange Server. The Exchange Server is reasonably config'ed ( Dual Core, 8GB RAM etc.) and has about a 100 users however Blackberry users will probably remain between 6-10 at the moment and 15-20 in the longer run.

Also, Does the Professional require the MAPI connector even though it would be on the same server as Exchange?