Hi Andy,
you could create 2 different Profils in Outlook with 2 seperate PST files:
http://office.microsoft.com/en-us/outlook/HA010549031033.aspx
Another solution is an additional software for your PDA that suppoort the
synchronization of different folders (calendars).
Those software products are "XTNDconnectPC", "PocketMirror" or
"Intellisync". A list of those software addins is on this site:
http://www.slipstick.com/addins/olpda.htm
--
Oliver Vukovics
Share Outlook without Exchange: Public ShareFolder
Web access for Outlook without Exchange: Public WEB PST
http://www.publicshareware.com