When signing in to your Office 365 account via File > Office Account > Sign In from any Office suite product, you receive the following error. In addition, your Outlook 2013 client might not be able to connect to your Office 365 mailbox either. That said, if you are already blocking legacy auth for Outlook clients (or you are reading this post after October 1st, 2022), you may receive the following error when trying to sign in to your Office 365 account with Outlook 2013 or any other Office suite product. Microsoft is deprecating basic auth on October 1st, 2022. This new requirement goes hand in hand with the deprecation of basic auth, requiring Outlook 2013 SP1 (build. This means older Outlook 2013 builds, and Outlook 2010 and earlier will not connect to Microsoft 365. 1 and greater) will be able to connect to Microsoft 365 services.

Please note that you can only uninstall Office 2016 from the Settings -> Apps menu, as nothing appears in Control Panel -> Programs.Starting November 1st, 2021, only Outlook 2013 SP1 (build. Until Microsoft issue a fix for this issue, simply uninstalling ‘Office 2016’ or ‘Microsoft Office Desktop Apps’ is the easiest fix to keep Office 2013 working. This appears to be because the Office 2016 files that are on the device are causing a conflict. When you try to load Outlook 2013 signatures, the window never opens. The second most prevalent error is with Outlook signatures. Should you choose ignore, you will have to run through the repair option down the road, which could lead to the same problem. The first issue that occurs is with the installation of Office 2013, as the installer gets to 90% complete, issues a “retry or ignore” error and never finishes if you choose retry. Unfortunately, this has had the side effect of breaking functionality within Office 2013. Since Windows 10 version 1803, Microsoft have decided to include the basic installation of Office 2016 / 365, presumably to tempt users to upgrade. Some Windows 10 users have reported a problem where Office 2013 installer gets stuck at 90% every time and there have also been issues where Outlook 2013 signatures will not open.

Office 2013 outlook