Outlook 2k3 on Win 7 cannot open shared calendars

I have a Windows 7x64 desktop joined to a Sever 2000 domain with Exchange 5.5.  The office uses shared calendars and this one particular user cannot open any of the shared calendars.  The error is "Unable to display the folder. The Calendar folder could not be found."  I have tried deleting the account from the Exchange server, deleting the profile from Mail, starting in offline mode and exporting the .ost to .pst, deleting the exchange account from Outlook, all to no avail.  I have another user in the office using the same setup that can connect to the shared calendars without issue.  The strange thing is that the user could connect on Friday then lost the ability when she arrived Monday morning.  No updates were installed.  I am out of ideas, any help would be appreciated.  Oh, and I have checked permissions against all the other users and they are set the same.
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Davis McCarnOwnerCommented:
Shutdown the PC.  Go to repair my computer from the advanced startup menu (F8 like crazy when the manufacturer's logo appears), login, and do a system restore.  Choose one labeled Windows Update or Critical Update from last week.

The beauty of this method is those restore points include most of Windows and resident malware can't reinfect during the obligatory reboot.

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MwvarnerAuthor Commented:
Machine was a new install and no updates have been installed since initial installation, when the user could connect.  So there is no restore point prior to the problem occurring.
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