I don’t quite know what’s going on yet, but it looks like Microsoft have had another outing with the above updates.
We know the security update 28387618 kills Outlook 2013; what’s unclear is the part 2837643 plays. It looks like, somehow, 2837643 is the “master” update which somehow also installs 2837618; ?. We’ve also had a lot of people complaining about Out-Of-Office not working which I’ve also found, whether this is anything to do with these 2 updates is unknown as yet.
I’ve just built a new W7 PC with Office 2013 and am patching it now (minus these two). Then it’ll be a case of applying different combinations of the two above updates manually to see what happens.
UPDATE 22/11/2013. It’s not looking good for these updates. My W7 test machine has Office, but not the above two updates. I can open up Out-Of-Office on this one, simultaneously try it on my W8 machine (which does have the updates) and it doesn’t open on the W8 one. So… it’s looking likely that these updates can (a) cause Outlook to crash and (b) prevent access to Out-Of-Office.