As your mailbox size increases, more resources are required to open each folder. If you have a large number of items in any single folder, you may experience performance issues during certain operations. For more information, see Outlook performance issues when there are too many items or folders in a cached mode .ost or .pst file. When you install Outlook, an Inbox repair tool (scanpst.exe) is also installed on your PC.
Some customers may experience a delay when trying to create a new email address, or alias, for their Outlook.com account. 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. We also released a new rule that corrected the wrong campaign verdict for all impacted customers during the incident.
However, we came across many users who are still struggling with this Outlook issue. They still wonder ‘Why is Outlook constantly not responding? ’ So, it is possible that your PST file will get corrupted and you can lose all important data. Or, if the problem is itself due to oversized PST getting corrupt, you need to recover PST data as soon as possible. Let us switch to professional suggested software. Run the classic Outlook advanced diagnostic troubleshooter if you've tried all of the preceding steps and Outlook is still crashing or hanging.
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 not opening on Windows 10 issue.
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.
The only other change to the Exchange Server was a certificate update for IIS. This is a standard DigiCert wildcard cert that we have replaced every year with no issues. 5) If you find an .ost file in the current window, right-click the file, and then click Rename.
Right-click the folder, and then click Properties to check your permissions for the folder. See the folder owner or your administrator to change your permissions. There is currently no option to revert to the prior behavior, but we would love to hear your feedback to help Outlook not opening on Windows 10 us with future designs.
The default SMTP port (25) may be blocked by some Internet Service Providers (ISPs) due to spam concerns. Currently, you can't use Outlook on Windows to edit calendars that are shared with your Outlook.com Outlook not opening on Windows 10 account, even if you've reconnected your Outlook.com account to Outlook. We're working to make it possible to edit shared calendars in Outlook 2016 for Windows. If you are having issues sending email, this might be due to validation issues with your Microsoft Account.
Perfectly repair and recover corrupted Outlook PST & OST files. It will resolve the Microsoft Outlook crashing issue to some extent. Test if Outlook is functioning correctly after disabling the add-ins. Let us try another solution to get this issue fixed soon.
It can automatically diagnose issues, troubleshoot, and fix problems with Outlook. A more general version that can also fix Office, Microsoft 365, and other Outlook problems can be found here. You can read how to fix your Outlook problem on the internet, but sometimes the suggestions don’t work for your specific case. So, we have produced this list of general things to try to resolve your problem in Outlook.
For example, writing gamil.com instead of gmail.com is a common typo that will cause problems with delivery. If you manually type in the secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary Outlook.com account. Refer to our comprehensive list of common SMTP settings or consult your email provider for the correct parameters. Incorrect SMTP parameters are a frequent cause of email sending issues. Your email client needs the correct settings to communicate with the SMTP server. To access the calendar Outlook not opening on Windows 10 shared with your Microsoft 365 for business account, you'll need to accept the invitation from Outlook on the web, iOS, or Android.
In the first place, check whether your antivirus is up-to-date. Reliable and trusted antivirus software vendors do care about compatibility with Microsoft Office applications, so there Outlook not opening on Windows 10 is a good chance that the issue is fixed in their latest update. If the above does not help, turn off the antivirus and see if it brings Outlook back to life.