While our new projects are on VSTS / TFS, we have some older projects on source safe that we aren't migrating. If you're in the same boat then you need to pay attention to the DST change that is coming up very soon. You could lose a checkin (possibly even the entire project history) if another one occurs within an hour of the first. Now, which is easier - banning all checkins on the DST change day, or reading a knowledge base article and following some simple instructions?

Kate