It wasn't *that* successful, they were even still running Windows 2000 on some m...

It wasn't that successful, they were even still running Windows 2000 on some machines when they decided to switch "back" from Linux. https://news.ycombinator.com/item?id=13643182

I wouldn't be surprised if the switch didn't help their problems at all, since if they didn't get rid of Windows 2000 when switching to Linux, they're likely still running some legacy applications on their homegrown LiMux systems and suffering from the resulting interoperability problems.