Originally Posted by Scot43
If you check with RIM Tech Support, they have a document that explains how to do this. It is possible and it does work. I started that way and have since moved it to a standalone box. One of the big concerns is that if there is a need to reboot, you have to bring bown the whole SBS box with the all in one approach. Also, be prepared to throw at least 2gig of RAM on the box running BES and at least 1.5 gig on the one running SBS premium. This is from experience, i had some strange lockup's and the additional memory has remedied all of them....
I have to say that as someone who is new to blackberry I havent found RIM particularly helpful on this matter, I have sent email after email and they dont seem to answer the question.