Outlook 2011 for Mac can’t find an identity even after several rebuild attempts

I had been cleaning up emails on Outlook 2011 for Mac as I had 5 years worth stored (20K+), primarily deleting old emails and moving some to draft folders. Before I did any of this I exported my outlook files (emails, contacts, calendar) as an .olm file to an external hard drive. I do this monthly anyways so I have a past back-up also. I launched Oultook 2 days ago and all the folders were empty and my account settings disappeared. I rebuilt the identity (holding option button down while selecting the Outlook icon)  and tried a few of the backed up identities and it still came up empty everytime (no emails in any folders) and no account settings. I reinstalled MS Office and updated the software and then rebuilt the identity from an external hard drive. Still nothing. Any suggestons? Thanks