What if you don't know where it was though? What if you saw a bit of text, but don't remember if it was in outlook, confluence (if so, which), mattermost (if so

What if you don't know where it was though? What if you saw a bit of text, but don't remember if it was in outlook, confluence (if so, which), mattermost (if so, which server), or teams (maybe a screen share?). Those are all systems I use at work, and while I've never been quite that lost about where to start, it's also not wildly exaggerated.