I have a customer who wants a solution that provides a maximum downtime of 4 hours if his SBS server suffers a catastrophic failure. He's asked a consultant to make recommendations, who's come back with some sort of 'Neverfail' solution, where a live and standby server sit there watching each other.
Thing is, I'm not sure if this is possible with SBS 2003, let alone if Microsoft will allow you to license it out.
So what exactly, would people recommend for a 4-hour resilient system? I'm thinking of a NAS drive maybe, but that wouldn't do Exchange. Can anybody suggest similar systems that they've set up?