Outlook 2010 task list on right pane not visible, problem in exchange mailbox?

We are using Outlook 2010 and Exchange 2010.
When I try open the task pane in outlook 2010 I get the following error: “Could not complete the operation. One or more parameter values are not valid.”
Steps to resolve the problem so far:
start outlook.exe with command line parameters /resetfolders /resetnavpane /resettodobar
scanpst.exe
removed ost, new syschronization
moved mailbox between databases (no errors)
started New-MailboxRepairRequest with all four corruption types (no errors)
New-MailboxExportRequest for tasks, removed all tasks, problem with outlook client still exists, reimport all tasks
reinstallation of office
create new profile on another machine, problem exists on there too.
All steps did not help. It seems the problem is connected with the exchange mailbox. Anything else I can do?
Thank you for ur help.
Andy

Hi James,
thank you for the tip. We tried it, but it did not help.
We removed the Task Folder with MFCMAPI and started Outlook with /resetfolders. We saw the empty Folder. When i turn on the right navigation pane and  let display my task list i get the "Could not complete the .." error, even now with empty Task
list. I then reimported a backup of the Task Folder.
I think the Mailbox on the Server is corrupt in some way, but the Problem is not connected to data in the Task Folder.
Any other idea? Maybe its best to remove the Mailbox and create a new one?
thank you,
Andy

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