For years all worked fine, but the last few months my Outlook client (2011 on Mac) causes all my gmail messages to be seen as "read".  This is very annoying and causes me to miss important emails.

I'm also accessing my gmail on my Android phone and my iPad (and occasionally on the web).

By disconnecting one access at the time I have managed to isolate the problem to my Outlook client.  

I can have all devices active, and also my Mac active with Gmail via web browser and all works fine. Only when starting Outlook, I get this problem.

Actually the messages are seen as "unread" for something like 1 minute, then they automatically change to "read" (and this is obviously synced throughout all my gmail 'access points".)

From Outlook I connect through IMAP (which i also use from my Android phone and my iPad). 

I have search high and low for a solution to this very annoying problem.  I have carefully reviewed all gmail setting and all seems toi be OK (no filtering or forwarding or anything similar...)

Is there anyone out there that has a clue what is going on...

/AnBe