Looks like Vista Update KB933928 may be the problem. I started uninstalling
the Vista Updates from this morning in order, starting with KB905866, then
929735. Each time I retested Windows Mail. It still had the problem. Then
I uninstalled KB933928. When I retested Mail it's working.
This tells me that it may be wise to turn off the automatic updating and
wait till the changes settle in. Let someone else do the testing for
Microsoft. Wait till they've seasoned for a few weeks or a month and then
install them. However, the definition file changes should be OK. Maybe just
be selective.
To uninstall updates, go to Windows Update, then View Update History, then
go to Installed Updates.
I hope this helps everyone who has this problem.
