Outlook 2003 SP3 Calendar issue "The function cannot be performed because the message has been changed". Hotfix for SP2 isn't working

This Question has been asked before for Outlook 2003 SP2. Which was solved by this hotfix (http://support.microsoft.com/kb/920061. We upgraded to SP3 2 weeks ago and this error message is back again.
Outlook 2003 SP3, when accepting an appointment, users are getting the following message:
"The function cannot be performed because the message has been changed"
This is not wide spread but its happening to enough users that I need to find an answer quickly.
All of the users are on Outlook 2003 SP3.  Some of the invites are sent from delegates.  Any assistance is greatly appreciated.

best regards,

Pascal GschwendAsked:
Who is Participating?
Well this problem happens when a user works with the 'cached mode', it may be a problem of a corrupted cache.
Ok, let's check this :
- Quit Outlook
- Go into this user's mail profile on the laptop and desktop and turning off the 'Use cached mode'
- Under the server name, save profile, start Outlook and let it synchronize all over again. If the missing informations in the Calendar are there and the error message is gone, that would confirm the cache was corrupt.

Hope it helps :)
Magnus BIT-supportCommented:
tried re-applying the hotfix?

Pascal GschwendAuthor Commented:
I tried reinstalling the hot fix as well as the rebuilding of the cache. Both didn't fixed the issue. It's still a 50/50 chance if its working or not. But thanks for the tips anyway.

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