Windows Live mail - Mail store location?

The Windows Live Mail's Message Store, in its default location, is a hidden folder, so ensure "Show hidden files and folders" is checked under Folder Options in Windows Explorer if you want to explore it.

To find the location of your Message Store, go to Tools->Options...->Advanced [tab]->Maintenance->Store Folder. The default locations are:

Vista/Window 7/Windows 8:

(C:\Users\<Windows user account>\AppData\Local\Microsoft\Windows Live Mail)

XP:

(C:\Documents and Settings\<windows user account>\Local Settings\Application Data\Microsoft\Windows Live Mail)