Many, many places (even academia, not just businesses) only allow Outlook to be used as an email client "for security" these days -- they actually go out of their way to disable POP and IMAP access and even use Microsoft's authentication system to get access. I've been using email for close to 40 years at this point, and I actually did use Emacs as my e-mail client in the 1990s, but that hasn't been possible anywhere I've worked for close to two decades at this point.