Posted 09 September 2007 - 10:10 PM
Outlook 2003 - perhaps 2000 similar
Tools > Options > Mail Setup
In the middle is a button Send/Receive
When the Send/Receive window comes up, at the bottom are options, for instance "Schedule an automatic send/receive every xx minutes" where you pick the xx value.
If that is different, try searching for automatic send or similar words in the Outlook2000 Help.