Until 2015 the vast majority of Macs at IBM were BYOD, largely driven by the EOL of that last generation of "our" Thinkpads (T6X series was the last IBM design)

Until 2015 the vast majority of Macs at IBM were BYOD, largely driven by the EOL of that last generation of "our" Thinkpads (T6X series was the last IBM design) drove a lot of technical IBM'ers to buy their own Mac. All of the Mac support was an internal forum created by advocates and a small IT team. VM's for Windows were common and remain for a few old legacy products that are too complex to port. Separate from the Mac stuff, the IT folks were working on web/app based solutions (web email access vs notes, etc). So that has softened some of the transition headaches. If some mac notes fix breaks, you've got the web and smartphone reader backups. All that got formalized into a "real" organization but it was really several years of trench Mac advocacy + webification that makes the numbers look so good now.