Don’t miss the great podcasts about how Microsoft is using SCCM internally, with Brad Andersson and Kelly Pranghofer.
ITC Podcast: How we use SCCM at Microsoft, Part 1
ITC Podcast: How we use SCCM at Microsoft, Part 2

10 cool facts
Fun fact #1: Microsoft is using one global SCCM hierarchy, one CAS, five primary sites, to manage about 300.000 PCs.
Fun fact #2: Microsoft is using a separate SCCM hierarchy (and team) for managing servers.
Fun fact #3: Microsoft are currently running ConfigMgr 2012 SP2 internally Kelly says. Interesting… 🙂
Fun fact #4: 70 percent of the PCs at Microsoft are running Windows 8.1.
Fun fact #5: About 13-14 percent are Microsoft folks using a Windows Server OS a desktop on their machines, cool 🙂
Fun fact #6: 35.000 machines are running #Windows10 at Microsoft (and growing).
Fun fact #7: At patch Tuesday, Microsoft internal goal is to have 98 percent of the machines patched within 7 days
Fun fact #8: Microsoft don't use many secondary sites anymore internally, only 12 or 13.
Fun fact #9: Microsoft are using 300 – 350 throttled DPs used instead of secondary sites (globally).
Fun fact #10: A few weeks before new updates are available publicly, Microsoft uses SCCM to deploy them to about 10k – 15k machines internally.