SonaVault (by Sonasoft)

SonaVault is an email archiving and e-discovery platform primarily for Microsoft Exchange and O365. It automatically captures inbound/outbound emails, indexes them, and provides advanced search filters. Admins can set retention policies for compliance. SonaVault suits organizations wanting a straightforward approach to reduce Exchange server load, comply with data retention laws, and perform quick e-discovery in case of audits or litigation.