Vote for Replay for Exchange
Replay continuously captures block level changes on the Exchange server’s disk volumes, and stores them on a Windows 2003 Server with any type of attached storage. These point in time recovery points are then presented in a Windows mountable format. This allows the recovery points to be browsed and accessed off line. Additionally Replay mounts off-line storage groups, dynamically checking them for data store corruption, as well as making them available for point and click recovery of the entire data store, or individual messages, folders, mailboxes, and databases.