In early 2005, before Microsoft announced the Windows Live brand, I was a Principal at Microsoft (and was told to keep the branding information a secret - not even my direct reports (senior dev leads) could be told about it)
At that time, it seemed like a big joke to me (because a lot of senior people seemed very excited about the changes - even though it just amounted to renaming MSN as Windows Live)
I suspect that a new crop of senior leaders at Microsoft are now talking abut how excited they at the latest change.