Unable to open items in Outlook 2007 public folders on 1 particular client

A particular end user can use OWA and open items in public folders, but this same user can not open the same item in the public folder through Outlook or any item in any public folder, when you double click to open the item you get this message: "Cannot open this item. You do not have sufficient permission to perform this operation on this object. See the folder contact or your system administrator."
This end user can also logon on another pc and use Outlook and successfully open items in public folders, he just can't from his own workstation.
I've un-installed and re-installed MS Office 2007 and that made no difference.  I've deleted the .ost and other files in the same dir and let Outlook recreate them and that made no difference either.

Any idea's how to correct this issue?
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compare the user profile permissions for this user with a similar profile for a user without problems
Malli BoppeCommented:
Try removing the workstation from the domain and re-adding.Also try recreating the outlook profile without cached mode.When you are recreating the profile delete all the outlook files even nk2.
jpassmoreAuthor Commented:
I was able to solve this issue, it turned out to be the end user had a GPG gui add-in in Outlook enabled, once we disabled this add-in the user was able to open items in public folders.

Thanks for your suggestions!

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Malli BoppeCommented:
whats GPG add-in
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