Hi VistaRookie!

Thank you for your efforts!

Unfortunately I'm looking for the reason, not for a work-around (like
creating new accounts/profiles), so it was in vain. (But may be helpful for
others.)

The mail store isn't a problem, it's IMAP. I want to know the reason.

The creation of a whole user profile would be much more effort than fault
searching.

(And perhaps the reason can happen once more - i.e. if it was a virus after
all.)


IE would be the engine used to run Windows Mail,
so, yes, I suspect the same reason for both
problems.

WM stores emails as .eml files, not as MHTML or MHT.
The difference is subtle. .EML files will not run in IE.
You can save emails manually as either extension and
even as plain .txt.

Yes subtle!

By the way: IE failing with *.eml seems to be only an extention issue. If
you rename WinMails *.eml to *.mhtml IE8 shows up the content of the mail as
WinMail does.

No wonder: all of them (*.mht, *.mhtml, and *.eml) is natively a bare text
content (just in "MHTML" format).


Here is what I would do, if I had the problem.

1) If anti-virus email scanning is turned on - look for this
heading:
FIRST:

Of course: I'd deinstalled anti virus first (because possible interfering is
well known). Thanks anyway for this hint.