Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.
Azure Archive Storage - Low cost, secure cloud storage for rarely accessed data.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Amazon Glacier - Amazon Glacier is a secure, durable, and extremely low-cost storage service for data archiving and long-term backup.
Hornetsecurity Email Archiving - Hornetsecurity Email Archiving is one of the advanced software that offers long-term, unchangeable, and secure storage of important company information, data, and flies.
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.