Outlook Send/Receive

[swanlzs]

Have a client with Outlook 2000 connected to Exchange server. The PC will not receive email until you click on another box (i.e. sent to, Out box or the address book). Then mail all comes in. Clicking on Send/Receive button on toolbar does not bring in mail. Anyone who logs onto this PC has the problem. Uninstalled, rebooted and reinstalled Outlook. Have checked Exchange settings, network settings and all appear ok and same as other PCS.
Is there a setting in the registry that can be changed?
Thanks much.