I CANNOT LOCATE MY MAILBOXES ON MY HARD DRIVE. I USE OS LION MAC MAIL

/Home/Library/Mail/ contain all the Mail data and mailboxes.

Exposing the /Home/Library/ Folder

Pick one of the following methods:

A. This method will make the folder visible permanently. Open the Terminal application in your Utilities folder and paste the following at the command prompt:

chflags nohidden ~/Library

Press RETURN.

B. Click on the Desktop, press the OPTION (⌥) button, select Library from the Finder's Go menu.

C. Select Go To Folder from the Finder's Go menu. Paste the following in the path field:

~/Library

Press the Go button.

Read Where are Mac Mail mailboxes located?

Please stop typing in caps. Besides being more difficult to read, it is also rude since it is considered shouting on the web.