Outlook rules doesnt work after migration from xchange 5.5 to 2000

Hello all,

We recently upgraded our xchange 5.5 to xchange 2k. We
migrated the users mailboxes using EXMerge utility. Now,
Outlook rules for all users doesnt work. Whenever the
user runs the rule, it always asks whether to keep/update
the rule on the client or server but never runs the rule.
even if the user creates a new rule on the new exchange 2k
server, the rule doesnt work. But every time a new mail
comes for which a rule was created (on old server), it
thorws an error saying the rule doesnt exist on the server
anymore.

Any help would be greatly appreciated.

Thank you
San