Alternatively you might like to set up a free Gmail account and use webmail instead of a PC mail client - you could access all your mail from any browser window then.

(I'm firmly in the 'use an email client' myself, because I loathe webmail thanks to its lack of flexibility. However, it is an option for many.)

I mentioned Thunderbird below, which is one option. You could also install my freeware yMail2 client and just use it to block & kill off (from the ISP's server) whichever of those 200 emails is causing Outlook to crash. Then download the other 199 into Outlook.