If there is an option for it, it will be in the Send/Receive Groups settings. In Outlook 2007 (sorry, I don't have access to 2010): Tools > Send/Receive > Send/Receive Settings > Define Send/Receive Groups. From there you can define the send/receive interval or disable scheduled send/receives completely, in which case you can also define a key to press when you want to receive email. Of course, since you're on Exchange, all bets are off because much of this is likely to be controlled by the server. But you could ask the server admin to set up something specific to your user account. There are also options that control what Outlook does when it receives new email, including sounds, desktop alerts, mouse pointer changes and system tray indicators, all of which can typically be disabled. Again in Outlook 2007 (sorry!): Tools > Options > Preferences > E-mail options > Advanced e-mail options.