Outlook calendar freezing and eating CPU and MEM

Ok, here's the situation:

I have a user running outlook 2007 on exchange 2005 server. When he clicks on his calendar. Outlook freezes taking 50% utilization (on a dual core) and MEM starts to build up.
I have tried about everything in the book, to try and fix it, here's a summary:
- launched outlook with about any swithc possibel (clean free/busy, resetfolders, all of them)
- installed a brand new pc
- deleted all items from his calendar
- deleted the calendar
- followed the MSFT article described here : http://support.microsoft.com/kb/318656/en-us

To make matters worst, note the following:
His webmail and PDA work like a charm.
On the new machine I logged in (so my AD profile, being exchange admin) and launched his outlook (his mailbox but with my pw), it works fine. I log out, he logs in, outlook hangs

Any thoughts?
thank you

LVL 9
KoenChange and Transition ManagerAsked:
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JohnGerhardtCommented:
Have you recreated the mail profile?
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JohnGerhardtCommented:
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KoenChange and Transition ManagerAuthor Commented:
I have given this user a brand new computer...that did involve creating a new profile on the new laptop, yes
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KoenChange and Transition ManagerAuthor Commented:
I have solved this myself.
Since i was quite convinced it was rights related, I have deleted the user account on the AD
this made the exchange mailbox 'orphaned'
I have then recreated the user and 'Reconnected' the mailbox to the newly created AD account (with new CLSID).
Exchange at that moment forces the owner rights on the mailbox for all folders to give the new AD account full control.
After a bit or rumbling to get the profile correct on the laptop, it now works again as it should.
I will therefor request a closure with refund
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JohnGerhardtCommented:
Glad to hear that you have found a solution.. Thanks for posting it too..!
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