Originally released in 2011, the Service Manager connector for Exchange has been updated to version 3.0. This version fixes several bugs and improves the functionality. The Exchange connector helps automate routing of end-user requests sent through email.
From the description:
Exchange Connector connects Service Manager to Exchange for processing incoming emails related to work items. Once Exchange Connector has been configured to monitor exchange mailboxes, it can be used to create and update work items based on templates specified by the admin. By specifying special keywords to look for in the incoming emails, admins can configure Exchange Connector to perform actions like approving or rejecting review activities, or enable activity implementers to mark activities assigned to them as completed.