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Except for the fact that the predecessor to Skydrive was released before Dropbox and is cross platform http://www.microsoft.com/download/en/details.aspx?id=26811

No reason to assume Skydrive wont also be cross platform.

You can actually access Skydrive on any platform via the web if you set up a sync profile to your online storage.

Comparing a web "sync" to an integrated solution like Dropbox? Tell me another one.

Dropbox is a web "sync" with a client. Skydrive is a web "sync" with a client and an API to write clients for other OSes. I don't see the outrage.

Its not a solution if I have to go write the multi-platform clients myself. Dropbox > Skydrive

You don't - you can mount it with WebDAV.