This article states a specific case but the solution has been known to fix
other mail folders. Also, the present thinking is that the problem is
caused by various Antivirus software misbehaving. The fix may be needed
again.
Although it's labelled as for mail stuck in the Outbox, it also works in
other folders. If you don't know whether you have a 32-bit version
of Windows or a 64-bit version, try the 32-bit version of the hotfix
first. Certain common antivirus programs, such as most of those
from Norton or McAfee, tend to cause this and other problems in
Windows Mail, so if you have such a program, remember where to
find the hotfix and hope it will install again if you need it again.
A recent version of the Trend antivirus program also causes assorted
problems in Windows Mail.
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