Most versions of the Norton antivirus program eventually cause problems
in Windows Mail, but seldom immediately. To stop them from creating
new problems, you need to uninstall them, not just disable them. You
then often need to run this cleanup program to take care of what the
uninstall often leaves behind:
<
http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039>
You may even need to remove your email account under Windows Mail,
then restart Windows Mail and add the account again.
I'm not sure that Windows Mail can handle any of the Hotmail accounts,
though, or any other email provider that only offers HTTP accounts.
If this cures your problem, you may want a replacement antivirus program
that doesn't cause such problems.
Most versions of the McAfee antivirus program and a recent version of the
Trend antivirus program are bad choices; they also cause problems in
Windows Mail. I recommend either avast! or AVG, either one with a
custom install where you tell it to leave out the part that scans email.
http://www.avast.com/eng/avast_4_home.html
http://free.grisoft.com/ww.download?prd=afe