Moving users from typical account to Google Apps Account
I have several users that signed up for Zoho using their work email address. We have since moved to Google Apps, and I would like to use the Google sign in rather than the typical sign in just for ease of use for the users. What is the proper way to go about doing this? I would assume they would have to delete their account, then re-sign up using the Google sign in? Please advise on the easiest way to transition them. Thanks!