[MegaDeKay]

It doesn't need to be "most". "Some" or even "a few" can be enough to make a hell of a mess if those few have created documents that are key to the business in one way or another (proposals, end-user documentation, etc). And there are the other components to the suite like Powerpoint, Excel, and Project to consider.

[einr]

So then act now, because the best time to act was yesterday, and the longer you wait the worse the mess and pain becomes. Not acting at all is not an option.