Question about Outlook Express

For the last three days, I have been receiving duplicate emails in my outlook.com account.  I have checked my Outlook client, and my email account is not set up on it.  I have checked the Windows Live Mail client, and the email account is not set up in that.  I did have a Yahoo mail account forwarding to my outlook, but I have even stopped that in an attempt to fix the duplicate email problem.  No luck.  For that reason, I don't think it's a POP issue. 

If I send an email to myself, I get three copies of it--2 received and a copy of the sent mail--in my inbox.  I always get a copy in my inbox of a mail I've sent.  I do NOT get duplicate copies of Facebook emails (oddly), but get two copies of all other emails sent to me, including Amazon, personal emails, etc. 

There are no other accounts set up in my email.  Also, when adding my account to my Windows phone, I cannot add it as an Outlook account.  It will only work as a Hotmail account.  My account was recently affected by the Outlook outage that lasted a couple of days, and then I got an influx of 500+ emails (all copies of old emails--even deleted ones) after my email started working again.  The duplicate emails started after this influx of emails. 

I have also tried changing my password, etc.  I have no idea how to solve this problem, as I've tried everything I've read, and I'm getting tired of getting two copies of every email and a copy of every email I send to someone else.  Anyone know how to fix this?