Simeon was an IMAP4 email client by The Esys Corporation. It was one of the first clients to support IMSP

IMSP

IMSP is Internet Message Support Protocol. Defined in a 1995 , which carries this abstract:Work on standardizing IMSP was never completed because development of the ACAP protocol, which has a superset of IMSP's functionality.- Implementations :...

, along with Mulberry

Mulberry

Morus is a genus of flowering plants in the family Moraceae. The 10–16 species of deciduous trees it contains are commonly known as Mulberries....

. It also supported MIME

MIME

Multipurpose Internet Mail Extensions is an Internet standard that extends the format of email to support:* Text in character sets other than ASCII* Non-text attachments* Message bodies with multiple parts...

 and Kerberos

Kerberos protocol

Kerberos is a computer network authentication protocol which works on the basis of "tickets" to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner. Its designers aimed primarily at a client–server model, and it provides mutual...

 authentication.

Simeon was available for several platforms

Platform (computing)

A computing platform includes some sort of hardware architecture and a software framework , where the combination allows software, particularly application software, to run...

, including Windows

Microsoft Windows

Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

, Mac OS

Mac OS

Mac OS is a series of graphical user interface-based operating systems developed by Apple Inc. for their Macintosh line of computer systems. The Macintosh user experience is credited with popularizing the graphical user interface...

, and X

X Window System

The X window system is a computer software system and network protocol that provides a basis for graphical user interfaces and rich input device capability for networked computers...

/Motif

Motif (widget toolkit)

In computing, Motif refers to both a graphical user interface specification and the widget toolkit for building applications that follow that specification under the X Window System on Unix and other POSIX-compliant systems. It emerged in the 1980s as Unix workstations were on the rise, as a...

 workstations, and it provided a similar look and feel

Look and feel

In software design, look and feel is a term used in respect of a graphical user interface and comprises aspects of its design, including elements such as colors, shapes, layout, and typefaces , as well as the behavior of dynamic elements such as buttons, boxes, and menus...

 on each system.

Simeon was the default email client installed on Heriot-Watt University

Heriot-Watt University

Heriot-Watt University is a university based in Edinburgh, Scotland. The name commemorates George Heriot, the 16th century financier to King James, and James Watt, the great 18th century inventor and engineer....

's IT infrastructure.