Hello cath1024 Welcome to the Windows 7 Forums!
Unfortunately with the new Windows Live Hotmail each user name or email alias becomes a new Windows Live ID. With Outlook Express or Windows Mail seen in Vista your one account there could see several aliases being the main difference.
There is a solution however to have various Live accounts listed as an option on one inbox namely the Outlook seen in MS Office 2010 now available in beta form. Once you open the inbox you simply click on the WLM account name to open the inbox for that specific account. The new OE will also import mail as well as send mail from various other email accounts besides Windows Live there.
With any WLM id you can look over and download the beta for MS Office 2010 Pro at http://www.microsoft.com/office/2010...s/default.aspx