For some unknown reason my Outlook has started downloading all my emails again.  I can't stop it, it's taking ages, they go back for at least 4 years, over 18,000-odd emails.  I had marked all emails in my inbox before this started as read.  Now I am being populated with old messages, I don't need or want, which are obviously all coming in as Not Read.  Restart hasn't solved it, I can't find anything online to help.  Anyone got any ideas.  At the moment, to read my new mail I have to log into Microsoft Outlook.com online! .... I really need it sorted soon as I am self-employed and need to see mail as it comes in!