Is the information still on the hard disc
Yes they are normally found in your PST file
PST stands for "Personal STore" - as in your personal mail storage. PST files are really fairly complex databases that contain your mail, your calendar, your contacts and even more, when you use Microsoft Office's Outlook mail program.
The default location under Windows XP is typically a location underneath "\Documents And Settings\username", where "username" is your Windows login account name.