The current Mozilla Suite is Version 1.7.12 and was released on September 21, 2005. Mozillia Suite 1.4 was released in 2003.
If you want the suite as opposed to Firefox and Thunderbird separately, you should to download and install SeaMonkey 1.0 instead.
It doesn’t hurt to have Mozzie, Firefox and Thunderbird all installed. I have all of them, plus SeaMonkey, Opera and cough IE cough installed. Firefox is my main squeeze.
So this is an advantage, having all this installed in one package. If you use all of those items. If you don’t use them all, it’s a disadvantage, because you’ve loaded down your computer with big programs you aren’t using.