SBS 2008 – Exchange Server 2007

Hi there,

Just wondering if any one came across or had dealt with the similar scenario as follows:

Is it possible to install an Windows SBS 2008 to mainly share exchange server/ share point service / active sync and blackberry email services with 3 different companies? It is like a exchange server hosted solution on a smaller scale to keep the cost down for three small businesses.

Is there any Licensing issue? Isolated global address list? any other advise?

regards