Well, I learned the hard way...
There is a SERIOUS bug in this Internal use Only version, #5207
Your outlook.pst file, which, we all know if the heart and soul of Outlook, is usually saveable/importable into any new version of Outlook.
Well, if you made the mistake like I did, and didn't save a backup of your Outlook.pst from the version prior to this(4920), then you will NOT be able to use your outlook.pst when the REAL technical refresh gets released...
Your outlook.pst will be saved in a state that NO OTHER VERSION OF OUTLOOK CAN USE!!
So, hopefully, you made a BACK UP of your outlook.pst prior to "upgrading" to this "Internal Use Only" version...
wase4711
