Does that go for a Windows 7 person ?
Will I lose my pictures, if I don’t click on the link ?
As far as I can tell, clicking on the link can't do any harm, and might save your files that are on OneDrive.
That said, I personally don't use OneDrive, so if I were you and you don't want to take chances, get an opinion from someone who has looked into it as a OneCloud user. Probably another FReeper can help on that.