I have a live account with my personal email address (*** Email address is removed for privacy ***), now i have set up my email according to http://schoudhury.com/blog/articles/email-address-with-your-own-domain-using-outlook-com/ in order to use outlook.com for my mails(instead of gmail)

I can log in to the outlook.com website with my email address(*** Email address is removed for privacy ***). 

I can not log in to this account via thundrebird(or windows live mail client). It seems *** Email address is removed for privacy *** which i use as live account is only an alias. 

Question:

Where do i find the "main" name (@outlook.com or @llive.com) which can be used in thunderbird? I dont know this address, and i can't find it on outlook.com settings page.