Well, if you have an account with zoho.com you can contact them. If it was not your account and someone else used your computer you can ask them. Not what you want to hear, but email providers protect user names and passwords like they are gold.
IE9----Internet Options---General---- Under Browsing History Click on Settings-----
Either go to the Current Location specified in the window there or then click on View Files.
There should be a whole list of files all starting with cookie:xxxxxx@whateversitewasloggedintodotwhatever.