SAP Business One on Windows Small Business 2008 64b Edition

Hi,

one of our client is looking into SAB Business One, we're about to deploy a server for them and have the choice of operating systems, either Windows SBS 2003 (32b edition) or Windows SBS 2008 (64b edition).

Is SAP compatible with Windows 2008 64bits, and Exchange 2007 64bits ?

Thanks,