I installed Yahoo messenger 9 but Yahoo Internet Mail was not installed simultaneously?

Yahoo Mail does not get "Installed" It is web based. All you need to do to access mail is click on the mail link above here on this page or any other Yahoo web page. If you are not already logged into messenger then just log into the Mail with the same ID and password you used to create your account.

A quick easy way to get to your email page is to click on the Envelope at the top of your messenger friends list window, that will open a browser to your email page.