How to Reconcile email,calendar and other data with a Blackberry?

With a BlackBerry, reconciling keeps the location and status of items like messages or calendar appointments consistent between your BlackBerry and Exchange mailbox (i.e., your Outlook Inbox). For example, if you read a message with your BlackBerry, and later open Outlook, you will see that the message won't be marked as read until you reconcile your email. In this document, "reconcile" and "synchronize" are used interchangeably, though Research In Motion (RIM), BlackBerry's developer, generally uses the word "reconcile" for email and "synchronize" for all other types of data.

Note: If you run the BlackBerry Desktop software on a computer connected to the Internet via an outside ISP, you need to establish a VPN connection for the software to connect to the BlackBerry Enterprise Server. (This applies only to the Desktop Manager and not the Blackberry Web Desktop Manager. No VPN connection is needed for the Web Desktop Manager.) Since the default software installation option places a shortcut in your Startup folder, you may wish to remove that shortcut to keep Desktop Manager from trying to launch before you can establish a VPN connection. Once you have a VPN connection, you can launch the BlackBerry Desktop software from the Start menu. 

http://kb.iu.edu/data/alov.html