Fix Error 0x8004210e in Outlook

Outlook 0x8004210e error code- This actual reason behind this error is that when you are already connected to another device, or in a situation where the mail server has not correctly closed the lock at the end of a POP3 session. When you try to access Outlook emails and suddenly show messages on your screen Error 0x8004210e:"Your mailbox is not responding" or "Your mailbox is temporarily not available".