QUOTE(madbassoonist @ Aug 14 2012, 09:52 PM)

I'm not trying to send an email with a large attachment. I simply clicked on 'Email Message' and a box appeared, telling me that 'There was a problem trying to open this message. There is not enough memory'. Deleting old sent emails has not helped. This has never happened before!
Can anyone shed some light on this problem? Bearing in mind that just an hour ago I had to restart the computer because it was telling me Windows 7 was no longer genuine.

(though that seems to have been sorted out now)
Oh the non-genuine message. That has nothing to do with the mail. To be safe, make sure you haven't got any virus/spyware.
Not sure about the mail thing at all. Try it again now, it may have been a problem on microsoft's side