How to retrieve all E-mails back in Mozilla thunderbird e-mail client

Before doing reinstallation of the Operating system Windows XP, I have copied all my C main hard drive files over another storage and then reinstall the operating system from root.
So the question is that If I want to get back all E-mails with attachments in the thunderbird client so where I have look them from my storage and in which folder of the C drive that i have copied all the data in the storage..
Any possibility to get back all E-mails with attachments. I just simply copies my C drive where normally all the data we store....including program folder..

Kindly reply me as soon as possible as I am not able to restore all those files in any case...
Best regards