My mailbox had grown very large 6.x GB which was causing problems with webmail loading so I decided to archive via Outlook 2013. I ran the archive but the changes aren't syncing back to webmail.
I also noticed that anything I add to Outlook like calendar items isn't synching back to server or other devices.
I also noticed an index.xml.bad dated from a couple of days ago in my Inbox folder which is when I was experiencing some sync and webmail problems.
Any ideas?