I just upgraded to Office 2007 SP1 on Monday.  Since then, the interface in
Outlook 2007 very quickly becomes extremely sluggish -- seemingly
progressively so.  For example, moving highlight from one message to another
may take 15 secs, then it will take several minutes or more.  There is no
apparent disk activity or unusual CPU usage.  It appears to be waiting for
the Reading Pane to update.  If I turn off the reading pane, it does seem to
not be as bad.

The email retrieval thread does seem to be working (sometimes very slowly)
in the background; the interface does update with unread messages received.

Outlook often (usually) remains open in the process list after closing the
interface.  I am forced to kill the process in order to switch to a second
profile.  This has been the case for some time (since installing in Mar 2007).

Have disabled all add-ins, AVG email scanner, etc.  What else can I try to
help with diagnosis?  When Outlook interface is sluggish, the close button is
equally unresponsive.  Kill process is the only way out.

Help -- anyone else with this problem?  No way to uninstall SP1, so I'm
looking at uninstalling entire Office and reinstalling... Ugh.