We use a hosted Exchange Server provider who still has us on 2003 server
while we're runnning Outlook 2007 SP1 at the local clients.

All is fine in general, of course, but we've been told by the hosting
service that one of the main features of 2007 that won't work properly until
they go to the 2007 server is Categories.

This has just become a very important topic to us since we've learned that
the best way to manage our Contacts is with Categories (and not Distribution
Lists).

How can I obtain a thorough and accurate picture of exactly what will be
lacking if we begin to use Categories at this time: what will be lacking now,
and what if anything will be lost or changed once the host does go to 2007
server?

Or should we just resign ourselves to not implementing the use of Categories
at all until the host has upgraded to 2007 server?