Oh, snap. Yeah, Norton and Windows Mail do not mix at all. To that regard, this forum has
a lovely tutorial on Windows Mail problems. I'd follow the Tutorial in regard to
Antivirus and other Security Programs with Windows Mail
Back up your data to a separate drive, not the C:\ drive. I like USB drives for this. A ten-gig USB stick has the space to back up everything that's vital to me: my personal files, my business files, mail and contacts, everything but my music, videos, porn and my Restore points.
The second way to crack this nut would be to repair the Windows Mail database, and see if that snaps it back to its old behaviour.
Read this page carefully before you download and run the utility, and
definitely back up your Windows Mail data (email and Contacts) before you do this.
Now, if that doesn't do the trick and your messages are still looking and behaving strangely, the third easiest thing to do is just System Restore your computer back to a point where you know Mail worked fine. Because your error is the result of 2 programs interacting with each other and both of those programs are "entrenched" into the OS, making it hard to analyze by piece to dig out defective parts, I recommend the System Restore for convenience's sake.
Use a point prior to Norton's expiration,
and if possible prior even to Norton's installation. Yeah, I know; that's usually a tall order considering a year is a long time, but it would be optimal. In any event, your Inbox's and personal folders' contents will not be affected by the restore. But back up your data anyway. It's a habit to get into.
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Since your subscription is dead anyway, you should uninstall Norton
(and if you encounter problems uninstalling it use Norton's uninstallation tool found here) and make the move to Microsoft Security Essentials. It's free and since it's programmed by MS it will behave well and in good conjunction with your preferred email client software, which is an MS product.
