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Opened Sep 22, 2025 by Lashunda Melson@lashundamelson
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Troubleshoot Outlook for Windows issues

If you can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook. This write-up is to help you get out of such a scene and get things back to normal as before with Outlook 2016 (and other recent versions too). Here, we have compiled a couple of workarounds or quick methods using which the whole Outlook won’t open mess will fly away. If Outlook is NOT able to start in safe mode, then try the next proposed solution below, entitled Create a new Outlook performance fixes Outlook profile. Use the classic Outlook startup troubleshooter to diagnose and fix several common classic Outlook for Windows issues for you. Sometimes, Outlook fails to open when it can’t load your view settings in the app.

In this case, you’ll have to remove your app’s cache to resolve your issue. Should you decide to remove a profile, back up the data files first. All offline cached content will be deleted when you choose Remove. For more information, see Introduction to Outlook Data Files (.pst and .ost). If your issue with Outlook persists, use the repair tool’s "Online Repair" option to fix your app problems. This option takes longer than the first one and requires an active internet connection to resolve your app issues.

Repair an Outlook data file (.pst) fileExit Outlook and browse to one of the following file locations: ...Open SCANPST.EXE.Select Browse to select the Outlook Data File (.pst) you want to scan. ...Choose Start to begin the scan.If the scan finds errors, choose Repair to start the process to fix them.More items...

If you decide you don't want the calendar you created, right-click the calendar and select Remove. To show or hide the Folders list, select Show or Hide the navigation pane. Calendar events can be used for your own personal event, or you can invite others Outlook performance fixes to create an in-person or Teams meeting. To change your Mail settings so your inbox looks and behaves the way you want it to, see Personalize your new Mail experience in Outlook.com. You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally. Post questions, follow discussions and share your knowledge in the Outlook.com Community.

To access the calendar shared with your Microsoft 365 for business account, you'll need to accept the invitation from Outlook on the web, iOS, or Outlook performance fixes Android. If you've already clicked the Accept button in Outlook 2016, you won't be able to re-accept the invitation from another Outlook application. The person who sent you the invitation will need to remove your permissions and then send a new invitation. This issue has been mitigated and we are continuing to monitor the issue to ensure stability. The root cause was the deployment of an incorrect campaign data file, which led to false positive campaign detection. We have since reverted to the right data file and the outbound email flow has returned to a normal state.

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 using the Windows Search service. The issues documented in this section have been reported after installing the recent updates listed below. We're investigating the issues and will update this page when a fix is available. In the meantime, please use the workarounds suggested for each Outlook performance fixes issue.

You should be able to go to Outlook via a web browser and reset your password. If you're entering a password you know is correct and getting a message that says "incorrect password," then you'll want to read this page. This process syncs your Outlook calendar to your Google calendar, as long as you keep up with your subscriptions. Note that it may take a few seconds to a few minutes for changes in your Outlook calendar to reflect in your Google calendar, depending when Google performs the search for new information. However, in most cases, the changes will reflect almost instantly.

This alias will be added to their account as a secondary alias, with the original 3rd party alias will continue to be set up as the primary. Once this step is complete, the user will land in their Outlook inbox and be able to use all Outlook functionality with this new email address. You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in Outlook.com as additional accounts in the Outlook profile. The folders storing all of your mail might be struggling to run because of how large they are.

It worked well and was fairly light-weight on system resources. Microsoft bought the company that made it and the product is no longer officially offered. However, you might still be able to find a download somewhere on the Internet. We love reading your suggestions on Outlook performance fixes new features and feedback about how you use our products! To learn more about how to share feedback, see How do I give feedback on Microsoft Office. You may notice that All, Unread , Mentioned and other sort and filtering options, such as By date, and Newest are missing in Outlook above your email list.

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Reference: lashundamelson/3885077#3