Word is going to start showing double spaces after a full-stop/period as a mistake, preventing the daily howls of frustration from copy-editors worldwide who are continually having to find/replace the damned things.
(And yes, I know lots of people were taught to type with a double space after a full-stop. I was too – because I learned on a typewriter, which is where this came from: to improve the kerning and create more readable text. Computers / word processors are rather more sophisticated than typewriters – they sort the spacing out for you. This means using a double space on a computer actually *increases* layout issues – especially when justifying text – so achieves the precise opposite of what people who do this think it does.)
I’m fairly flexible as an editor most of the time, but along with *always* advocating the Oxford Comma, killing post-period double spaces is one of the few editing hills I’m prepared to die on.
