A lot of the comments are talking about people running their own personal email server. However, the post is more about arguing that organizations running their

A lot of the comments are talking about people running their own personal email server. However, the post is more about arguing that organizations running their email infrastructure will become rare, and I'm not sure I agree with the author's thesis. The challenges there are rather different. Spam is less of a problem: in B2B the correspondent is well-known and will be whitelisted quickly, while one can pay for extra spam filtering if needed. User experience isn't a biggie because frankly the biggest users aren't the ones paying. The real issue is TCO vs data independence - and in my limited experience I still see plenty of organization which still run Exchange (or equivalent) on their own domains.