Having been an avid supporter of oopensource and freeware products for almost 7 years of my professional life, it's time to throw in the towel as far as user experience regarding the above two products is concerned. I've grown really sick of the huge memory bloats these software are. Firefox and Thunderbird take a whopping 100-200MB each (and always growing) of my machines memory and bring a P4 2.4GHz with 512MB DDRAM to a crawling speed.
Long ago (a few years ago), I'd tried out Eudora 4.x and it used to occupy a measly footprint of 16MB at all times (or almost). Of course, it didn't have esoteric features nor did it have all the authentication mechanisms. Apart from these "downsides", my major problem with it was that it didn't have an option to forward messages "as attachments". That, IMO, is a major drawback in corporate world.
Any recommendations ? I still want freeware :)