When Does This Error Occur? There is no particular time or situation when this error may occur. If the causes for this error message are prevalent, you will be notified of it via the Microsoft Outlook Unlicensed error message. What Causes This Error? If you are wondering what causes the Microsoft Outlook unlicensed error message, then read on to discover about the most common causes that lead to such errors. They are.: The subscription license has ended product key you have used is wrong system time and date are incorrect How to Resolve This Error? Follow the instructions given below and you can easily combat this error and get started on Microsoft Outlook without any disturbances or interruptions. Step 1- Sign in using the correct account Sometimes, you might have signed in using a wrong account, and this could be the root cause of the error. To be on the safe side, sign in using all the different email accounts until you get the one that you had used to sign up for your Microsoft Account initially. If this does not work, go to the services and subscription section and check if your Microsoft subscription is listed there. If it does not appear there, it means your email address won’t work for signing into Microsoft Outlook as that account is not the correct registered account. Step 2- Check for Multiple copies of Microsoft Outlook One reason for this error could be due to the existence of multiple copies of Outlook existing on your device. If you find multiple copies, make sure to uninstall all of it and then re-install it. https://livesupportonlinechat.com/en-us/how-do-i-fix-microsoft-office-unlicensed-product/