Last update: June 2019
Applies to: Outlook 2019,365, 2016, 2013; Windows 7, 8 or 10.
One reader sent us the following question:
Here’s an issue i just encountered: After launching Microsoft Outlook 365 to access my email i get stuck.. the login window comes up and stays for a while and then an error message stating that “the Outlook Window can’t open” comes up. I am using a Windows PC if that’s helpful for your troubleshooting this. I wonder my the software doesn’t open.. If it helps, a friend mentioned i should be using a specific command to launch a clean Outlook install so the installation can be repaired.. Any pointers on how to recover my Outlook access are appreciated up-front.
Thanks for the question, indeed a tricky one to troubleshoot online, but we’ll definitely try
First and foremost, i would assume that you are using Outlook 2019, although fixing this issue for earlier versions is not majorly different.
As you mentioned that the Outlook login dialog came up and stayed for a while, we’ll start out troubleshooting by looking into into any Outlook COM add-ins that are installed in your system and for some reason are not firing correctly causing Outlook to hang up when starting up.
These add-ins extend the functionality of Outlook to allow you (for example) to interact with PDF files, integrate with OneNote, work with SharePoint, launch a Skype meeting, etc’.
In order to start troubleshoot this we need to be able to launch Outlook without the add-ins firing up. That is accomplished with the so-called Outlook safe mode.
Kindly proceed as following:
Note: How do we know that Outlook started in Safe Mode? That’s written in the upper side of your screen and visible in Mail, Calendar, People, Tasks panes.
Note: You can turn off the safe mode by simply closing Outlook and opening again by hitting the Outlook icon on desktop, task bar or program list.
Proceed as following:
If this didn’t help, proceed to the next section.
In case that you have customized your Outlook navigation pane, chances are that Outlook might encounter an issue opening the default Outlook window View.
In order to reset the navigation pane settings, proceed as following:
If this didn’t help, you might need to create a different Outlook profile, we’ll cover this in one of our upcoming guides.
Here are a few follow up reader questions that we have received as a follow up on this post:
There could be times that even after fixing an Addin launch issue, Outlook will continue to launch in safe mode. If this is the case, then hit the Windows Search magnifying glass, type Run and then type Outlook.exe, this will launch the program in normal mode. If this is not helping, the there is probably a failing Add-in issue. To fix that, go through the steps outlined in the section at the beginning of this tutorial.
Kindly leave us a comment in case of questions.