Location of email folders and address book in Windows Mail?

I had a Dell desktop with Windows Vista. I was using Windows mail on the same with more than 25 email accounts and over all it was containing more than 5 thousand contacts, email address and messages. Yesterday suddenly my system crashed and is not booting up. After troubleshooting I found that my MOBO is dead. Fortunately hard drive is fine.

Now the problem is how can I take all my contacts, emails and addresses from this HDD to my another working PC. Where are all those data located? Somebody please help. Its very serious and important for me.

If you have installed Windows Mail on your new PC, just check what its Store Location is. It should be the same or probably similar to the older one.

Or, you can check out these locations:
C:\Users\username\Contacts
C:\Users\username\AppData\Local\Microsoft\Windows Mail

Alright, I got it. Thanks for the help. I have one more question. Can you please tell me how can I import those messages and emails etc to the windows mail installed on my another system? Can I just copy those folders and paste it to the store location on new hard drive?

There are various ways for doing the same. You should better check out this article: http://www.oehelp.com/backup.aspx It contains all those methods of backing up.

Just copying the folders and pasting it to the new hard drive store location will work only for Contacts and not for the emails I guess. It use to be located at C:\Users\username\Contacts folder. Though you may face some problem with file ownership but that could be fixed later.