Chances of recovery of T-Mobile Sidekick data are "extremely low"

T-Mobile Sidekick users have been facing a downtime since last one week. Apparently, the users have lost all their personal data [ calendar, contacts, photos, to-do lists ] stored on Microsoft's servers and not backed up locally.

Surprisingly, Sidekick folks have issued a letter to all its subscribers expressing their inability to recover the data because they do not have a working backup!