I currently use Outlook 2003, but am having problems with it.

What other email provider would you suggest ?

Oh, and I have several different email addressess (Google, Gmail, Yahoo, Hotmail Windows Live ID).

Is there any way of intergrating them so that they can be opened without actually having to load the site??

Thanks

If you are looking for an E-mail client that will use POP E-mail, then Mozilla's Thunderbird would be an option.
Regards,
John

I agree with jgweed that Thunderbird is a great full featured e-mail application.

Here are some Thunderbird FAQ and Other Sources of Thunderbird Information that are worth reading.