It was still a signal. Signals matter, especially when a company is in distress.
> And Office was not charity project for MS, it made a hefty profit. Also it was much easier to convince corporate buyers to buy Office if they could use on Office Suite across their entire organization - even for those hippie Mac users in the corner.
I didn't say it was a charity project and your interpretation is far too lenient for Apple. First of all, Microsoft definitely did NOT have any problems selling Microsoft Office after at least 1995.
Secondly, that "hefty profit" was peanuts for Microsoft. It wasn't a "move the needle" type of investment for them.
They did both those things purely because the DoJ made Gates sweat.