Windows Live Mail

<Moved from Windows 7 | Network & Internet>

I don't know if this is were I have to report or ask this, but maybe someone can help me sort this out.

My emails in windows live mail 2010 are good yesterday and still in the same folder.
When I open my Windows Live Mail this morning.
All of my emails are gone in their folders. even in storage folder that located to default location.
So I browse it and found out, it was all save to imported folder and named another folder by the date today. 09-08-2015.

I was grateful that it was safe and still can be opened.

The issue is, how come it goes there unnoticed? Did I do something wrong? and what it maybe?

Thank you.