The second rule of IT (the first is, obviously "have you tried turning it off and back on?"), is this: Never do anything major on a Friday afternoon or a Monday morning. It's common sense, really; when Friday comes around, you're focussed on the upcoming weekend, so your concentration is a bit off, and if anything goes wrong, you'll try to rush things in order to try and fix it (which will go horribly awry). Monday morning is fairly similar, bit with an added complication: something has bound to have failed over the weekend, so it's pointless to try and do something big when you're going to get five phone calls in the first half-hour. So, that's why you can't get IT to do anything at the start or end of the week!