Even The Cleaners Are Against Us
A while back, I was sysadmin for a small-ish call centre in the southwest UK. Amongst our various servers was a small unit that had originally been a desktop, but had had Linux installed on it and was temporarily acting as mail server for the company. Now, whilst we had UPS for our "mission critical" machines - PDC, fileserver, db server, and the server that ran the call centre package we used - the little Linux mailserver was just plugged into the wall like any other desktop.
It ran fine for about a week following deployment. Then, the first Monday morning following installation, I arrived in work to find the early-rising MD running around like a headless chicken. "Email is broken!" she wailed. "Fix it now!". First port of call, obviously, was the mail server, which I found be sitting awaiting approval to run a full disk check. "Odd", I thought, and let it run. An hour or so later, mail was back up and all the stuff that had been sent over the weekend arrived in people's mailboxes.
All was fine for the rest of the week. The following Monday, I arrived in work to find that "email is broken again! Fix it now!". Of course, I went to look at the mailserver.
This time I found that it was unplugged. Consequently, I asked about the areas that the weekend cleaners covered, and was told that yes, the server room was an area that they were supposed to clean, and yes, they had a key.
I affixed a small Post-It note to the plug that read "DO NOT UNPLUG!", and the mailserver served us reliably and faithfully for another six months until management made good on their threat and bought a new server and a copy of Exchange. But that's a whole other story...