After updating Office, you may experience a brief flashing window every hour, which triggers the OfficeBackgroundHandlerRegistration task to start running. In this case, sign in to the Microsoft 365 portal by using your administrator credentials, and then select service health to determine whether other customers are experiencing the same issue. If other customers are experiencing the issue, the issue should end when the service-interrupting event is resolved. If you’d like to share any feedback about this article, please let us know.

Some configurational changes or default features of antivirus can restrict the connectivity of your Outlook to the server. You can either manually disable such features from your antivirus program or temporarily uninstall why is Outlook not opening the antivirus from your machine. Outlook not responding or not working is a common issue faced by Outlook users. This may occur due to outdated system drivers, virus or malware infection, lack of system resources, or system overheating. It may also occur if the Outlook data file is damaged or corrupted.

We’re working to make it possible to edit shared calendars in Outlook 2016 for Windows. If you are having problems with Outlook, there are a few things we can help with to get you back to sending and receiving your email. A vast community of Microsoft Office365 users that are working together to support the product and others. If you have Outlook in your startup folder, remove the shortcut from the startup folder. Visit the Technology Help Desk Support page to locate your local campus contact information or to submit an online technology support request.

Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running. If so, wait a short time (usually two or three why is Outlook not opening minutes) to see if Outlook starts working again.

The built-in why is Outlook not opening back-off mechanisms in the indexing component of Windows Search or WDS pauses the indexing of Outlook data when the system is under heavy use. The easiest way to let the indexing finish is to leave Outlook running overnight.Additionally, you can reduce performance issues by running Outlook in Cached Exchange Mode. In this mode, Windows Search or WDS searches the local copy of the mailbox instead of the mailbox content on the server. I even reduced mailboxes sizes and that didn’t help, I setup a new user (albeit existing PC but new windows profile), and he is having the same issues. If the mailboxes open automatically after removing them and restarting Outlook, they may be auto mapped. This setting can be changed by an Exchange admin by submitting a request via Jira and including the usernames of the client and the usernames of the mailboxes that need to be removed.

Start classic Outlook in safe modeIn Windows 10, click Start.Type Outlook /safe, in the Search programs and files and then click OK.Close and re-open Outlook.If the issue is resolved, you can keep working, or if you have time, take the following steps to find out what COM Add-in is causing the problem.

If you’re still having problems, you can try resetting your Windows Firewall settings back to default. Once the add-ins are disabled, close Outlook 2016 and restart the application normally to check whether it now opens as normal or not. You can determine if it’s corrupted by creating a new profile and changing which profile is used when Outlook starts.

When this registry key is set, Outlook will use its own built-in search engine. The built-in search will display the message below to indicate it is not why is Outlook not opening using the Windows Search service. The issues documented in this section have been reported after installing the recent updates listed below.

After finishing one step, if it does not resolve the issue move on to the next. Clear unnecessary files from outbox and trash folder to optimize the performance of your Outlook application. Also, try to use the necessary Outlook features to enhance the performance of Outlook as well as Windows. A disturbed internet connection can lead to errors like 0x800CCC0F, 0x a and 0x a. Avoid using unstable or low why is Outlook not opening internet connection and use a reliable and high-speed internet connection with reasonable download/upload speed.

While using Outlook, you may encounter some common Outlook issues and errors, which may create problems for users. We have discussed in detail the 10 most common Outlook errors and the possible solutions to fix them. However, when you attempt manual methods, they may cause corruption in your PST files. This kind of error usually indicates some issues on the disk where your Outlook PST file is located.

If you are having problems with Outlook, there are a few things we can help with to get you back to sending and receiving your email. “Outlook Not Responding” is a typical issue seen by Outlook users. There are various possible causes for this error, some of which are listed below. Here, we will go through the detailed troubleshooting solutions to resolve the Microsoft Outlook error. If you access your why is Outlook not opening Outlook.com account through the iOS Mail app, you may be repeatedly asked to enter your username and password.