The shared calendar information is stored locally in an XML file.

This file become corrupt and is the reason for the issue. SP1 was suppose
to fix this issue however i do not believe it did. Restarting outlook is
supposedly a temp fix to clear the problem however not a real fix.

You could also wipe out your calendar navigation pane information clearing
the xml file by going to the shortcut in the taskbar for outlook and changing
the /recycle to /resetnavpane

Start outlook and it will clear your entries and allow you to re add shared
mailboxes. VERY ANNOYING MS

Do not forget to change the /resetnavpane back to /recycle or you will clear
your shared calendars over and over.

We currently exist in a mixed exchange server 03 / 07 environment. I am not
sure if this contributes to the problem or if it is simply on the client side
with the poor handling of the XML file.

I am attempting to remove 07 office suite and see if i can remove office SP1
so that i can do a reinstall.

Office sp1 currently does not allow it to be removed or reapplied and is the
reason for the office uninstall / reinstall trouble shooting.



"Jon" wrote:

I have Outlook 2007 which was upgraded from 2003. My Outlook 2007 runs
on a Citrix Terminal Server on Windows 2003 Enterprise Service Pack 1.
I access the Terminal Server from a Wyse thin client. My Outlook 2007
uses MAPI to communicate with Exchange 2003 Enterprise Edition. I have
no other account types configured.

During the course of the day Outlook decides to flake out and render
the error "The Messaging interface has returned an unknown error."
This occurs when trying to view any of the 14 other person's calendars
I have been granted access too. I am trying to access these calendars
from the "People's Calendars" pane.

Closing and re-opening Outlook seems to resolve access for an
undetermined amount of time. I'm not fully able to reproduce the error
at will but I have noticed it most frequently when going on 15 minute
break or 1 hour lunch.

I'm not using cached mode or PST's of any kind. My mailbox is not
terribly bloated - about 457 MB's per Exchange System Manager.

I have reviewed Event Viewer on both the Terminal Server and Exchange
Server and can find no evidence of why I get blocked.

I have tried some of the Outlook command line switches and eventually
just created a new Outlook profile. None of these eliminate the
problem.

Does anyone know of a solution to this?
___________________________________________
Remove dots before at to reply direct - Jon