Help MY computer cannot open a microsoft outlook mail online

MY computer (windows 7) doesnt open a microsoft outlook mail address online is just says that it cannot display the page or that the page is unavailable i have tried all the browsers I have IE,OPERA,MOZILLA,and GOOGLE CHROME. but its thesame response what should I do thesame site opens on other laptops.

Thanks

What is set in Control Panel ==> Default Programs ==> Associate a file type or protocol
for Protocol MAILTO (protocols are all the way down after file types)

and what is set in Control Panel ==> Default Programs ==> Set your default programs ==> Outlook
are all of the defaults set? "This program has all its defaults"

You might want to compare your settings against one of the machines that doesn't have the problem.