Is the Avast email scanner doing this and if it is can I turn this off, It's really bugging me!
Avast scanner does not 'open' the emails... just scan them.
This seems to be a problem in your OE settings.
Did you allow the lower preview panel in the OE (View or Layout options)?
What is really happening, your messages are opened, just displayed, mark as read...?
No I have not allowed the preview panel, and I've checked every other feature I can think of. This never happened until the day I installed Avast.
The emails are being displayed as read. I did a little experiment last night, I received email and waited about 7 seconds then the new email in my inbox turned to read (the little envelope icon went from a closed one to an open envelope and it was no longer in bold the way a new message is)
So I went up to Edit, clicked "mark as unread", then I waited and watched again, in a few seconds the message was marked read again. And I did this several times, and I noticed that every single time the little Avast blue ball icon would spin when the messages were marked read. No matter how many times I mark a message read it will change it.