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> productivity suite called simply "Office"

Microsoft Office.

I doubt Microsoft can own a name as generic as Simply "office".

Office.eu does not hold any resemblance to Microsoft Office in terms of logo, typography, makes no reference to MS, etc.

Of course they can sue. The most competent employees at MS are likely their lawyers and lobbyists anyway.

If you'd read the article you'd see this one's called "Office.eu" or "Office EU", which is fine.

Microsoft never called their productivity suite "simply" office, nor have they registered a product under that name.