I was given delegate rights to view my boss's Inbox. That delegation
right has since been removed, but I still get their meeting invites
and meeting acceptances. This has also happened to another colleague
who was given delegate rights to another colleagure. Again, the
delegate rights have since been removed, but they are still getting
the meeting invites and acceptances.

I've searched and found references to people wanting to hide them,
move them, delete them and other sorts of things, but haven't come
across anyone who is still getting them despite not having the
delegate rights anymore. It's not the end of the world, but is a bit
annoying when you get a dozen acceptances for a meeting or worse
still, you accept a meeting on behalf of your boss by mistake!

We use Exchange and Outlook 2003.