The old business I interned with used a Windows 2000 server until December 2013 - when the business finally folded. The server outlasted the business that owned it - having been bought second hand sometime in 2006/07, already near 8 years old.
That server was a Pentium II machine, with a whopping 128Mb of RAM, a pair of 9GB disks in RAID 1 for the OS, and a pair of 32GB in RAID 1 for the data. It also came with a pair of lockable Zip-disk drives for which we'd long since lost the keys, an unmatched DvD-rom drive that was added sometime in the last decade.
And it kept plodding along right up until November 2013 when one of the Data disks failed and decided it wasn't going to drop out of the array - completely nuking the company's accounts folder on the mirror.
There were other reasons why the company failed - but I suppose having the accounts for the last 7 years smeared across the platter in a headcrash was just another nail in the coffin.
The Machine itself was still running when the business was shut down for good. It's probably still working now too, doing God Knows What for God Knows Who? It's built like a bloody tank and did exactly what was asked of it for 14 years.