>I worked at 3M for 10 years. It's as enterprise-y as it gets. They didn't upgrade to a new OS on machines until they were retired. They had a three-year policy.

Which makes my point. There is a reason for enterprises to do that.

>>Have you ever worked in an enterprise environment? This comment is so out of touch with reality that it is hard to believe that you even understand the enterprise. Enterprises run hundreds of applications and more often than not, applications that are more than a decade old. If an application requires activeX, edge is just not an option. Which IT department can afford to force every activeX web apps out of their enterprise?
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>>>>Enterprise environments still will wait one or more years. the latest update proves they are right. Many of them just moved from XP to 7. They won't bite the bullet yet to go to Windows 10. Preferably they'll wait until other have solved certain problems. There are no compelling reasons for any self respecting company to rush to Windows 10. Windows 7 works just fine and will be for the foreable future.
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>>>Many enterprises don't upgrade across all computers, instead opting for a phased upgrade and hardware is replaced. That means a three to four year upgrade path.
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>Where did I imply not a single computer gets upgraded? I didn't. Note I specifically said "across all computers".

Where did I implie the contrary?

>As for testing the hell out of it, I've seen that bite enterprises I the ass. When I was at 3M, they didn't patch the OS on anything until the tested the hell out of it. It sometimes took months for a particular patch to roll out. Then one day, because they failed to roll out a patch, malware affecting SQL Server hit there servers, completely bringing down one of their divisions for several days. They could have avoided it by simply installing the patch.

Well that is no different than that a new update could bring an enterprise down. I've seen it all to often. Latest Windows 10 update has caused us massive problems at two of our clients. Web cams don't work anymore. PC and app freezing, C5 crashes. It costed me over a month. Last year a windows update caused crystal reports to fail to export to PDF.

I assume you're referring to the slammer virus which was relatively easy to cure (costed me just a few hours). However those things above were an order of magnitude worse.