The right mouse click has a menu system all of its own. Screen appearance, fonts, colours, even which folder sent mail goes into are all totally customizable. It offers to be your default mail if you want it to be, it offers to load straight into one users configuration at startup, then offers a drop down menu to change to a different user. It has built in BBS functionality, unlimited mail folders, endless address books and newsgroups, sophisticated mail filtering and powerful news kill files options. I suspect I have only found half of them so far.
Tech support is available from half a dozen sources, including mail, phone and the web site.
To purchase, Use the built in order form which encrypts your credit card details. Better specification machines are of course recommended.