What do you do when the customer says he/she is getting the error message that the account has been locked?

The customer is unable to logon to the Microsoft email win account 

Usually accounts are locked for invalid activity, entering the incorrect passwords for multiple times or it can be a server issue.

So the possibilities vary!

What account do you mean ? can you explain

I fully agree with the answers been added by EXPERTS...............Thanks.

1. unlock his account.
2. ask him if recently renewed his password and if yes, ask him to update all devices that hold his account with the new password.
3. ask him to login to his webmail account and then go through the settings that allow him from log of from any device his account is configured on it and he can't access ti right now to update his password.

I did not got the question can you clarify it more !

I did not got the question can you clarify it more !

The user is using account and it is a local account.