Azure Archive Storage - Low cost, secure cloud storage for rarely accessed data.
Thexyz - Secure premium email service with mobile sync apps for calendar, contacts, tasks, notes and FISMA compliant email archiving.
Amazon Glacier - Amazon Glacier is a secure, durable, and extremely low-cost storage service for data archiving and long-term backup.
ZixArchive - ZixArchive is a cloud-based solution to collect, store and search archived emails.
Mimecast Cloud Archive - Reduce costs with Mimecast's cloud archive to move to the cloud with a single, secure archive for email, files and other content.
Barracuda Message Archiver - Barracuda Message Archiver is an application that enables you to retrieve and retain all email communication while reducing storage recommendations.