All that said, the toughest thing about a new PM is getting her/him to stop putting two spaces after a period.
It has been a while since I opined on this topic, but here is more info:
Chicago Manual of Style: In response to the question One Space or Two?
One space .... There is a traditional American practice, favored by some, of leaving two spaces after colons and periods. This practice is discouraged by the University of Chicago Press, especially for formally published works and the manuscripts from which they are published.One Space Between Sentences: Adapted from Robin Williams, The Mac Is Not a Typewriter; Berkeley: Peachpit Press, 1990
Webword: One Versus Two Spaces After a Period is a report that includes lots of references to people who think about this sort of thing. They all agree on one space.
My company publishes quite a bit of stuff, so we really need to pay attention to this sort of thing. I know it's hard to break the bad habits your high school typing teacher beat into you, but it's the right thing to do.