This article provides a list of software products and cloud-based services used for email archiving.
Email archiving has several objectives: long-term preservation of knowledge, regulatory compliance, legal protection, etc.
For example, the preservation of historical records may require a one-time migration (change of format) and storage, while regulatory compliance generally calls for the systematic and continuous archival of messages, using a solution that provides storage and retrieval of email over extended time periods.
They may be offered as a standalone computer appliance (possibly in the form of a virtual machine), as installable software that can be deployed on the user's premises, or as a cloud-based service.
Those products may perform compression, de-duplication, encryption, indexing and advanced searching.