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Unable to edit Calendar appointments or Contacts in Outlook 2007

I have the following environment:
Micrsoft SBS 2003 Server SP1 with Exchange 2003 SP2
40 Outook 2003 Clients
5 Outlook 2007 Clients
All client PCs running Trend AV
All Clients fully patched via WSUS (Office and Windows)

The problem is as follows
Any Client PC that has Outlook 2007 installed cannot edit, change or dismiss reminders from the calendar. The same goes for Contacts.
When the idem is created in the calendar there are now error messages to indicate that there have been any problems

When someone tries to open the appointment by double clicking it, the error (Cannot open item. Unknown error) appears
When trying to dismiss the reminder that is generated a similar error is displayed

If the appointment is created by someone who is using Outlook 2003 then the appointment can be edited by anyone, including the users on Outlook 2007
If the appointment is created by someone who is using Oulook 2007 then the appointment cannot be edited by anyone.

I have tried the following
1. Re-creating the mailbox on the exchange server
2. Disabling the Antivirus
3. Removing Office 2007 completely (Also deleting the resitry entries) and re-installing from the media

There are no error messages in the even logs on the server, even with all the Exchange logging turned up to maximum
There are also no errors in the event log on the client PCs

Any help would be greatly appreciated
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TeamMaclean
Asked:
TeamMaclean
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1 Solution
 
MCKreedCommented:
Have you deleted the temp files created in the \Documents and Settings\user\Local Settings\Application Data\Microsoft\Outlook or  \Documents and Settings\user\Application Data\Microsoft\Outlook

or starting outlook with outlook.exe /cleanreminders

Try looking into the com add-ins

tools==>trust center

click on ad-ins on the left hand side

on the bottom make sure manage com addins is selected and click go

this brings up another screen with a list of addins. Disable all of them see if anything changes. Then turn them on 1 by 1 to see if any cause a problem.

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TeamMacleanAuthor Commented:
Had a look at all of those.  Disabling all the Com-addins has no effect.

I can delete appointements manually but it still kicks up errors
The specific Error messages I get when deleting an appointment from the calendar is
"The move, copy or deletioncannot be completed. The items might have been moved or deleted, or you may not have sufficient permission. If the item was sent as a task request of meeting request , the sender might not receive updates. Unknown Error"
However the item is then deleted.
I have checked all the mailbox permissions to make sure that the user has permission on the mailbox.
I have checked all the user permission from within outlook too.

When trying to dismiss reminders I get this.
Cannot turn off the reminder. You may be reminded again. Unknown Error
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TeamMacleanAuthor Commented:
Found that the problem lies with the Exchange server. More specifically the server is Running Trend Mail Security.
When the Trend Mail Security Master Service is disabled the problem goes away.
I have tried re-installing the software, but this does not fix the problem.
Any Ideas?
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