> My Sr. Admin is asking for that. Maybe you should ask your Senior Admin why he wants a version 2.6? 2.6 are very old, they date back to Aug 2004 for the latest one, many new rules will not work, many plugins will not work, so you are likely to miss a huge bunch of spam.
It sounds as sensible as planning to install an anti-virus that is 3 years old. Bests, Olivier