HP OpenMail
（重定向自OpenMail）
OpenMail (also known as HP OpenMail) was an enterprise email messaging and collaboration product from Hewlett-Packard.
It was known for its ability to interconnect several other APIs and protocols, including MAPI, cc:Mail, SMTP and MIME, and was originally based on the OSI standards such as X.400. In addition to email, it also supported directory, public folder, and contact-management functionality.