Vote for Hexamail Vault
Hexamail Vault provides a centralized automatic email archiving solution. Efficient full-text indexing and compression algorithms ensure that scalable and high performance email archive is generated automatically.
Hexamail's email archive software leverages indexing and compression technology to create a compact index of email data. Inferior solutions often simply push emails to relational databases or worse, file systems. Such systems suffer from poor scalability, lengthy query/discovery times and extremely high storage requirements: often requiring more space for the archive than the original email!