A new small client with an SBS 2011 server and a couple of pcs came up with an interesting problem. A mixture of office version and outlook versions proved a problem for Exchange 2011 – with 2003/2010 outlook clients working well but the outlook xp / 2002 would mysteriously show no body of an email that was replied to. Viewing through OWA via the SBS 2011 worked fine.
No fix on this one though as the Outlook client was replaced by an Outlook 2003 client and the problem stopped. One to watch out for though.