I opened my laptop today and received about 6 of the same e-mails in a row in my Inbox over EAS. I went online, and those e-mails only exist once on the SM server -- and in the Junk Mail folder, not in my main folder where I received the 6 copies.
I was also missing about 6 other e-mails from my Inbox that exist online but not in Outlook via EAS.
So, I exit Outlook, delete my OST, go into my account, and delete my EAS sync record in the Connectivity tab.
I then come back into Outlook ... and all is not well. I now have hundreds of identical e-mails in my inbox in Outlook, and then from days ago!