I have a user that seems to have a peculiar issue with Outlook 2010.  He archived old emails, and can open the file and sub folders fine and had been working and thing were good.  A few weeks ago he came to me saying that he was missing emails for a certain date range from his archived sub folders, a few hours later he thanked me for fixing the issue for him because the messages were back.  (I hadn't done anything yet.)  About a week later he came back saying that messages were missing again, this time from a different time range.  It's been over a week and the messages are still missing.  (I've been tied up with bigger issues so I am just now getting to look into his issue.)  I checked his computer and Auto Archiving is not turned on, he is using a Win 7 x64 with Outlook 2010, emails come from an Exchange server (not certain what version we are running there) and default data file is a .OST file, he has two archive folders (Archive and Archive1) both are .PST files and are stored in the default location on his C.  I haven't used the Scan file tool that comes with Outlook yet; email is not my forte` so I haven't done anything yet other than checking the basics.  (Also, I have no access to the Exchange server, and we have 100's of users, but I only have the 1 user that is effected.)

What might have caused this?  Where should I start or what should I do?

Glitter_Geek

It might be possible that  'Auto Archive' has cleaned up your inbox and archived old messages. Ask the user to lo gin through OWA and check if the deleted emails are accessible via OWA or not.