I've got a single Exchange 2010 Server in operation at the company I work for. All clients hitting that server from the desktop are using Outlook 2010.
Recently, I had a user (the company president, of course) who had a very large chunk of the email in his inbox completely disappear - everything prior to mid-May. Initially I thought that perhaps an auto-archive had taken place due to the very large size of this account (roughly 7gb), but no .PST file can be located. This issue seemed to have only affected the Inbox itself, as all other folders and sub-folders have contents goingback several years. I've completely removed his account settings from Outlook on his PC and re-added it, but the missing email is nowhere to be found. Interestingly, the email in question is also missing from his account on his iPhone as well, which leads me to believe that this has nothing to do with Outlook on his PC.
Now, a few days later, the same thing has happened to another user. In her case, it is also everything prior to roughly mid-May, although I think it is a different day than the first affected user. I know that it was not a size issue in this user's case, as her mailbox is only 270mb on the server.
In both users cases, I can long into their accounts via the Outlook Web App, and see no difference - the missing mail is still missing there as well.
Both users are panicked of course, as both had vital older emails they were saving that now appear to be gone.
I'm not really sure where to go with this, as it is not something I've ever seen before. Has anybody else ever encountered this, or have any idea what may have caused it? Or better yet, anybody have any idea how I might be able to fix this?