Get userid for email account logged into from my PC

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.

^ This.

Unless the person who accessed the email account wants to tell you there is no way of knowing.

Check the cookies...   xxxxxx@zoho.com will actually give the id of the persons who used your rig to access their mails.....

Thank you alyoshka. Where can I find the cookie? All I need is the userid. Don't need the password.

Windows contains a whole folder called cookies.... most probably in the Temp Folder or the Browsers Temp Internet Files Folder...

Firefox---Options----Privacy---Show Cookies....

This is IE 9..

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.
 

Why do you have to retrieve an email address? Can't you just ask that person for his/her email address?