You might receive "Unable to find mailbox timezone: Error 0x80004005" (you
can check the msextmz.log for errors). This might happen if the mailbox has
never been logged into. To resolve this, login to OWA for the user specified
in the error message and create a meeting request or an appointment and try
re-running the tool again.
http://support.microsoft.com/default.aspx/kb/926666
---cheers
we are also getting those error messages. However we didnt apply the
926666 yet. does that mean that after we apply that patch those
errors won't show up anymore?