They are part of the project above all: 1) Borealis Navigator: http://binaryoutcast.com/projects/borealis/# 2) Interlink Mail & News: http://binaryoutcast.com/projects/interlink/ The respective versions for XP and Vista have also been forked by Roytam1.
I tried Interlink. The software is essential,no frills. It also supports multiaccounts but it is quite difficult to configure them especially if some IMAP and POP. The project is young but for my needs it is necessary to wait.