As others have stated mileage balance is zero. As also has been posted a Star Alliance Award I have now shows up on my account which it did not on United.com.

I had 3 existing United tickets. On some of the tickets I had already started travel. The used segments are gone from the reservation, however they are visible in the e-receipts which seem to accurately display what I paid. My seats (all upgraded) are still there. The United PNR has been replaced with a new PNR which I assume is one in SHARES.

All my reservations have the following message on them...

"A modification has been made to your itinerary. Please contact United Reservations to have your ticket reissued."

It seems like the migration of PNR to SHARES started at least for me on February 25 as all my tickets say they were ticketed and issued on February 25, 2012.