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Wouldn't be surprising. As it turns out, lots of businesses run on Microsoft technologies.

I think the poster was questioning why they weren't running a more recent version of Exchange such as 2013/2016

My company uses 2010 as well. It's regularly patched and supported for another two or three years. Why fix what's not broken?

(Yes, I know Clinton used 2010. Her admin was a dumbass though).