You can use the following to figure out where it's stored
http://www.pc-pages.co.uk/Outlook_Ex...ok_Express.htm:
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How do I save my outlook express settings so that I can keep all my e-mails etc if I format my hard drive and re-install windows
Open outlook express.
Choose Tools-->Options from the menu
Click the Maintenance Tab
Click the "Store Folder" button (3/4 way down the page)
This will give you the path to all the files that hold your e-mail with one file for each folder such as inbox,sent items etc. (they will have the extenstion DBX)
Navigate to that folder with the windows explorer and save the files as appropriate.
Next you can save your mail account/accounts as follows
Choose Tools -->Accounts
Click the Mail Tab
Select your accout
Click the Export button and save as appropriate.
Your windows address book is normally located at
C:\Windows\Application Data\Microsoft\Address Book and will be of the form "Yourname.WAB". (if yours is not there then simply search for *.WAB and it should find the relevant location).
Now to replace the mail messages after re-installing windows then you simply need to copy the saved DBX files back over the new ones created by outlook. NOTE that if you created your own folders in addition to the standard ones (Inbox etc) then it is best to create these folders again first before copying the data to the folder. IE only copy data over existing folders, don't copy folder data where there is not already a file of that name.
To replace the mail accounts choose Tools -->Accounts
Click the Mail Tab and then click the Import Button.
For the address book you can simply overwrite the new blank one with the saved one.
Can I Store my outlook express messages on a different hard drive to my normal system (C:) drive?
YES, open outlook express.
Choose Tools-->Options from the menu
Click the Maintenance Tab
Click the "Store Folder" button (3/4 way down the page)
Click the change button and point to the drive and folder where you wish to save your messages.
The changeover will occur after you close outlook express and re-open it.
Should you re-install outlook express then it will create new folders in its normal location but you can use the same method above to point to your existing mail folders and it will give you the option of using these folders instead of the ones it currently has (which are of course blank if you have just installed outlook express).<hr>