What strikes you when looking at the installation instructions for the securiQ and organiziQ Suites is the sheer number of operating systems supported. Although the mail server has to be Lotus Domino, alongside the familiar Windows platforms we see IBM OS/2 and AIX, Sun Solaris and a couple of Linuxes. We're told that from January the mail server will not have to be Lotus Notes, but our review was not able to verify this.
securiQ focuses on the management and security of email traffic, with features such as anti-virus available. This allows you to use your tool of choice, but does seem unfair given the cost. organiziQ manages the administration and overheads incurred by email.