Perceptive Enterprise Search can index messages, contacts and notes from the most popular email clients, including Outlook, Outlook Express, Vista's Windows Mail, Lotus Notes and Mozilla's Thunderbird. It can also index emails on a mail-server, accessed via IMAP or POP.
Perceptive Search will index the body of each message, along with any relevant metadata, such as To, From, Subject and Date. When searching, indexed emails will retain their formatting and will display as they look in the original email client.
You can optionally index email attachments; Perceptive Search can index over 400 different file types that can either be directly attached or zipped and attached to an email message.
More information