I suppose it’s due to two primary reasons: 1. It integrates best with their company groupware server, which is probably some variant of Exchange. 2. A lot of

I suppose it’s due to two primary reasons: 1. It integrates best with their company groupware server, which is probably some variant of Exchange. 2. A lot of people (inexplicably to me) seem to really like using Outlook. They understand it well, the UX is relatively static, and it is powerful.