Vote for EmailXtender Archive Edition
With its single-instance storage technology, EmailXtender Archive Edition removes duplicate messages and then compresses messages for a compact message archive. The archiving is transparent to users.
Features: Automatic message migration: Periodically extracts messages from the message server and archives to the archive server; Duplicate message elimination and compression: Reduces size of archive; Access via message shortcuts: Provides transparent access to archived messages while reducing size of messaging server; Full-text indexing: Enables search of messages and attachments; PST and NSF file management: Eliminates unmanaged email records; Broad messaging platform support: Includes Microsoft Exchange, Lotus Notes/Domino, UNIX SendMail, Bloomberg Mail and Instant Messaging.