Your Outlook emails might be moved to the Junk folder. Check this. If you find your emails there, move them to the Inbox. Right-click on the email and select Move to > Inbox. You might have ...

I started thinking Gmail was losing my emails. I'd remember seeing a message, look for it later, and somehow couldn't find it ...

Did you open Outlook today and think, "Why does everything look different?" Maybe the message list looks squashed, the reading pane is in the wrong place, or the whole layout feels unfamiliar. Happily ...