My friends at Apple all have their own offices with doors.

Not for long, once the spaceship is done.

Traditionally that was the case with Microsoft but they've rebuilt at least the Azure buildings into no-private-space hellholes (IHMO). It was a major reason why I didn't pursue a position there - yuck.

Microsoft's buildings are converting one after the other ones into open office. About 8 to 12 people per office.

That seems more team-space than open office (lots of people see that as a sort of a "happy medium" between real open office and everyone-has-a-private-office that allows team to collaborate more effectively than the latter but provides less extraneous distraction than the latter; not sure I share this assessment, but I definitely see it as a distinct thing from either alternative.)

When I applied there and was given a tour of several areas it seems to be small team rooms that could fit, at most, 10 people. But this was also in just two parts of two buildings in their headquarters so who knows if that's the norm across the entire company.

This is changing. They believe that open offices are the Future of the New Collaborative Workforce or some similar nonsense.