No access to public folders from Outlook 2007, while access from Outlook 2003 with same AD account.

I have a Win2003, with Exchnage 2003 installed on it. People use a lot the Public folder features. One person got a new computer with Office 2007 installed instead of his usual Office 2003. After some days needed to adapt, the person realized that she had no access anymore to the public folder (Access refused). When she goes back to her old computer, using the same Active Directory account, she has access to the public folders. I tried to create a new Public folder with full access for her, but from Outlook 2007, she cannot access to its content. Is there some security setting in Office 2007 I've to turn off ?
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Computer101Connect With a Mentor Commented:
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Hello Webhunter76

can you please tell me if it is office 2007 professional or corporate.  thanks Ben
Yo may need to set up new group policys for outlook 2007 users - "High security levels can result in limitations to Outlook functionality"
WebHunter76Author Commented:
Thanks to bcoussens for your answer.
It is a french version of Outlook 2007, part of Microsoft Office Small Business 2007. I made all recent Microsoft updates on it.
The translation of the error message is the following :
Unable to display (not extend or expand) the folder. You do not have appropriate permission to perform this operation. You do not have sufficient permission to perform this operation on this object.
I read which seems appropriate.
But it is a risky manipulation (according to Microsoft). The point that perturbs me is the following. From Outlook 2007, I see the Public Folder arborescence, with all the subfolders. I can open two folders, which are Contact lists and the other is a calendar. For all the other folders (which have email content), I cannot see any of its elements. When I access the same folders, with the same Active Directory account, from Outlook 2003 (or from WebAcess) installed on an older computer, I have full access to all the folders.
On the other hand, what do you suggest to do with group policies, wchic secutiry setting should be lowered.
A last detail, which is maybe irrelevant, on all the public folders, a have a two-sided blue arrow, in Outlook 2007.
WebHunter76Author Commented:
It all works now. I added Exchnage server in Local Intranet setting in Internet Explorer 7. But that didn't seem to help. I closed my Windows session. I tried with another user and it worked. I retried it with the original user which had problems, and everything works now. Woudl the closing of the session been suffcient, or the fact to connect another user would somehow reinitialize the connection ? I personnally thing that closing the session would have been enough... Thanks in any case.
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