If you’ve ever been curious about what would happen when a cloud service fails, then you don’t have to wonder any longer. Earlier today, customers of T-Mobile and Sidekick data services provider Danger, a subsidiary of Microsoft, lost access to all their data. Some believe that this data wipeout is because of a botched upgrade. Why it happened matters little to those who are unlikely to get their data back, according to a note posted on T-Mobile forums.

Regrettably, based on Microsoft/Danger’s latest recovery assessment of their systems, we must now inform you that personal information stored on your device — such as contacts, calendar entries, to-do lists or photos — that is no longer on your Sidekick almost certainly has been lost as a result of a server failure at Microsoft/Danger. That said, our teams continue to work around-the-clock in hopes of discovering some way to recover this information. However, the likelihood of a successful outcome is extremely low.

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