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Do you do backups of your mac?
When was the last time a back up was done?
Also......how are you accessing your HOtmail (Microsoft Live) email account?
Theres really only 2 ways.
The first way is to use your Web Browser (like Safari, or Firefox, or Chrome), go to the hotmail login page, and login. And thats it.
The second way is a bit more complex, as it uses an application to RETREIVE and SEND your emails.
The default Email app on a mac is called simply "Mac Mail" (but there are many other Email apps out there for use, OUTLOOK is another one)
So, the question.......which are YOU using to access your Hotmail account?