Corporate rollouts to 20,000? Meh.
IIRC, Amazon rolled out a major order entry, inventory search, payment & shipment tracking system to over 200 million desktop users last year.
I believe their end user operating system platform used a bunch of capital lettered components glued together with a poorly named language, what was that, oh yes, now I remember, HTML, CSS, and Javascript.
No need to call the bouncer over, I'm getting my coat. Please leave my Chrome running on Win 7 when I get back from paying the Hypocrite Tax.