I just got this call from Derpa, head of a department that uses computers more than most other departments.
Derpa: My emails are missing. I should have hundreds in my Inbox but there are 21.
Cow: Ok, I'll connect up and take a look.
{Look up user's IP, run VNC}
{It says
Inbox (21) and I see that there's plenty of emails in it.}
Cow: Everything looks pretty normal. Do you remember a specific one that's missing? If we can find it, all the others are probably there with it.
Derpa: Yes. One on 10/18 from Derpina.
{I do a search for from: Derpina. We see the one she mentioned. It says it's in the Inbox}
Cow: Ok, maybe you have a display filter or something. First, let's see where the messages stop.
{Scroll to the oldest, then scroll smoothly to the one she mentioned}
Cow: It seems to be there ok. You do know that the "21" next to "Inbox" just says how many are unread, right?