[simonw]

It's also a great case study of a hybrid model, where .Net application servers are complemented with open source components such as Redis and HAProxy.

[sajidnizami]

Exactly.

Initially they weren't using anything OSS but moved to HAProxy and Redis. They even help update HAProxy from time to time.

http://nosql.mypopescu.com/post/2669915777/powered-by-redis-...

[kristianp]

No mention of the "L" word in this thread. Stack(Overflow|Exchange) is running Linux! (and windows of course).