"Open your email inbox" button in WLM launches in a browser

I use Windows Live Messenger and Windows Live Mail. Until yesterday, when I clicked on the "Open your email inbox" button in Messenger, it opened Windows Live Mail and I could sync my folders. Yesterday, I signed into another Hotmail account using Firefox, and for some reason this Hotmail account was added to my list of accounts in Windows Live Mail. I deleted that second account from the list, but now, when I click on the 'open your email inbox' button, it opens my original (main) Hotmail in Firefox, not Windows Live Mail. I don't want to use a browser, I want to use Windows Live Mail, but I have searched through the options in both programs and have been unable to find a tickbox which says something like 'Launch Windows Live Mail when clicking on "Open your email inbox" button in Windows Live Messenger'. I am using Vista. Can anybody help?

Reply 1 : "Open your email inbox" button in WLM launches in a browser

I want WLM to open through live messenger also but it opens in a browser....what's going on... I want it back !