Recurrent calendar entries lost

OS = Windows XP Pro SP1
Client = Outlook 2002
Exchange = Exchange 2000

1 client on this network is experiencing recurrent calendar entries disappearing with no apparent reason.
The entries will be there for a certain amount of time (approx 2 weeks) then just disappear.
Single entries seem not to be affected.
On reinserting them they will hold for a period of time and then be lost.
This applies to all recurring entries.

No other workstations have this problem.

Any help would be appreciated