Hey pcalvert, thanks for the reply.
I'm still using IceDove (Still haven't changed to claws yet) and i guess one way to lighten the load of IceDove would be to clear out (archive) a lot of the older messages etc (of which there are quite a few). But i still feel that, like Firefox/IceWeasel etc, IceDove is getting somewhat "Heavy" as it matures & progresses, and getting slower as well. That's why i'm considering the change, although it's not something that i'm looking forward to, mainly because, for one thing, i'll have to convert (somehow) the address books from IceDove to claws. Then there's the archiving of all the messages..... (Groan!)

I'll probably never need them or read them again, but you can bet that if i don't save them somewhere, i'll need "some" of them at some future time! LOL!
So i take it that claws doesn't do HTML mail then? No biggie i suppose. I'm quite getting into lighter apps at the moment and have started using both kazehakase & midori instead of IceWeasel. They're not as "Featured" but they're a lot quicker & midori is really coming along in leaps & bounds.
Anyway, many thanks again for the reply. I shall definitely look into claws asap.