How do I change how frequently Outlook attempts to get new messages?

This is getting maddening. My inbox is currently set to connect to the server and search for mail every 5 seconds - each time, I click over to it, and get caught in an email loop of send, check, receive. How do I reset that search for new mail timer to, say, every 10 minutes?

Much appreciated.
Update: Ah, yes - forgot to indicate version.

Outlook 2007.
2 answers 2