Simeon was an IMAP4 email client by The Esys Corporation with support for IMSP and LDAP.
[1] Simeon was available for several platforms, including Windows (3.x, 95 and NT), Macintosh (both 68k and PowerPC), and multiple Unix variants.
[2] Although commended for its rich features as an early IMAP client, its difficult interface was regarded as more complex to use than POP based mail clients.
[1] Lack of advanced filtering of mail and inability to easily manage multiple mail accounts (Simeon requires editing of configuration files) were also criticized.
[2] Simeon was the default email client installed on Heriot-Watt University's IT infrastructure.