Wh are advantages/disadvantages of Windowed mode?

It seems like more and more we are having to use windowed mode with FS9 to overcome some problems
with Win 8.2 and Win 10.
I've never used windowed mode so need info from some who have.
Just what are the disadvantages of using window mode other than smaller image size on the screen ?
with Win 8.2 and Win 10.
I've never used windowed mode so need info from some who have.
Just what are the disadvantages of using window mode other than smaller image size on the screen ?