An interesting quote from Bill Gates' AMA reddit session today

What one Microsoft program or product that was never fully developed or
released do you wish had made it to market?

"We had a rich database as the client/cloud store that was part of a
Windows release that was before its time. This is an idea that will remerge
since your cloud store will be rich with schema rather than just a bunch of
files and the client will be a partial replica of it with rich schema
understanding."

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Cloud service with with a rich database and schemas, with your client as a
partial replica.  Sounds quite close to the RWW!