You think there is no confusion possible? It's a very obvious knockoff of Microsoft's product. And unlike office, which is kind of generic, the use of 365 for a productivity suite is certainly specific to Microsoft.

It's sad that you can be sued for using numbers.

MS can't copyright a number.

I'd say that coming from a company who pushed a standard called "Office Open" to undermine standardization on ODF, that'd be rich.