In 2020 I worked for an MSP and we had to fix a broken Windows 2000 machine because it was the only machine that a certain medial office could use to send a receive faxes. They could not afford to upgrade a more modern system, as it necessitate a forklift upgrade of all their systems that would go into the 5-digit dollars. They didn't have that money and no one could get computers quickly in 2020 so fixing it was the only option. After 20 hours of troubleshooting it got bounced up to me, because managed the team that had to fix it. I went into the office after they closed and everyone was gone, because pandemic. I pulled the machine in question out of the corner of the "server room" (read: poorly ventilated closet) it was in. An old Gateway full ATX tower, it was a sight to behold underneath the dust. Turns out the dust was the problem - it hadn't been cleaned at any point in the last 20 years and there was a literal quarter inch of dust and lint on top of the motherboard. I cleaned that thing till it sparkled, set up back up and turned it on. Worked PERFECTLY, like nothing had ever been wrong. I was happy, the client was overjoyed and my bosses were happy. Good stuff.

The PSU blew 7 months later, taking down the motherboard and drives. Paperweight. So we took the full backup we made after I fixed it, turned it into a VM, set up a USB passthrough and gave it a USB fax modem. I left that job a while back, but to my knowledge it's still working. By the time we had done that we had billed over 30 hours of work to the client at $150/hr. That's a $4500 Windows 2000 fax server with added VM licensing on top of it. Pretty silly at the end of the day.