| | Re: BES Express 5.0.3 on same box as SBS 2011
There is no general problem running SBS2K11 and BESx on the same box. Possible problem, which also arise with SBS2K11 without a BES server are that the exchange store service might be unable to start automatically and has to be started manually. Since the BES Server depends on the exchange services, the same might occur with the BES services.
Microsoft itself does not recommend to run Exchange on a DC, but according to a microsoft KB article accepts the needs of the customers to do it anyway as a reality.