I just whined about this elsewhere, but this makes a good post, so:
1. a very good feature of default Win32 message boxes is that they implement Ctrl-C to copy the error message and window title into the clipboard (formatted and everything)
2. way too few people know this, and accordingly, custom message boxes basically never implement this
3. if you work on custom UI libraries that have some message box facility, you should!
@rygorous so many times in a support role have I asked people to use this, and so many times do they ignore our request and screen grab the message box (or entire screen), paste that into a Word document, then email the Word document
@ajft @rygorous luxury! people these days film the screen with their phone, and send a video