Yesterday I was using Outlook 365, there was one URL in one of the emails and I needed to find other emails containing it. Trivial and one of main use cases, right.
Put URL in search box, 0 finds (including email I just copy&pasted it from). Mkay, maybe non-alphanumeric chars are messing with some internal regex or similar, stripped those into bare hostname, still 0 finds (when searching all mailboxes, including body).
Maybe its some exchange settings, who knows, who cares. Pissed off fighting such basic tech instead of doing actual work.