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Opened Oct 26, 2025 by Deloris Hovell@delorishovell4
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Fixes or workarounds for recent issues in classic Outlook for Windows

To edit a shared calendar, go online to your own Outlook.com calendar, open Calendar for Windows 10, or use a mobile device. Read how to Add your Outlook.com account to another mail app. We are aware that some users may not be able to receive email from Gmail accounts.

You can read about it and then run the Microsoft Support and Recovery Assistant to see if that helps. It can automatically diagnose issues, troubleshoot, and fix problems with Outlook. Note that the above link is for desktop Outlook for Windows. A more general version that can also fix Office, Microsoft 365, and other Outlook problems can be found here. Faulty hard drives or disk errors can corrupt the Outlook data stored locally. This creates crashes that seem random—until you dig into the hardware logs.

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. A software rollout over the weekend was deployed incompletely, causing one component to send a high volume of messages to another component that had been deleted, overwhelming the routing plane servers. Availability has recovered, and engineers are investigating the root cause and identifying Outlook Fix resource center problematic servers. The team is sweeping all remaining capacity to identify and address residual issues. Get Help has troubleshooters for classic Outlook for Windows you can run for many common scenarios, such as Outlook startup or profile setup problems. These often help resolve issues without the need to contact support.

Use the classic Outlook for Windows connectivity troubleshooter to troubleshoot Outlook connectivity issues. If your mailbox is full, we won't be able to reply to your request. Check that you have not Outlook Fix resource center accidentally blocked the Gmail domain when blocking one Gmail user. We will update this article as soon as we have more information on a fix.

The app might refuse Outlook Fix resource center to launch or crash at the splash screen. Sometimes, antivirus real-time scanning can slow Outlook down. Configure your antivirus software to exclude Outlook files or processes from real-time scans to avoid interference. The good news is that Outlook has a built-in tool to scan for corrupted files. You can also make PST files a smaller size that won't corrupt as easily. The issue might be difficult to identify if you have multiple accounts and a long history with Office 365, Exchange, and Outlook.

The bad news is that the ScanPST.exe program doesn't work for severely corrupted files. You'll need to acquire a recovery tool designed for bigger jobs. Search "PST Repair Tool" and you'll find many reputable programs who know how to fix this Outlook issue.

We love reading your suggestions on new features and feedback about how you use our products! To learn more about how to share feedback, see How do Outlook Fix resource center I give feedback on Microsoft Office. 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. To access the filtering options faster, add them to your Quick Access Toolbar.

Although it's not possible at the moment to turn the feature off entirely, you can choose to remove it from your favorites list by right clicking the folder and selecting Remove from Favorites. To help you get rid of these duplicates, we have released a fix which will automatically clean up your contact list. This fix will clean up duplicate contacts for end users starting August 9, 2023. Rollout of the fix to all users will take few weeks, so, some users may see the fix applied by the end of September. Add an Outlook.com alias to your account and send email to Gmail users using that alias. For more information, go to Add or remove an email alias in Outlook.com.

Following the fixes above will help you keep your Outlook running smoothly and protect your productivity. We hope this guide proves useful in resolving your Outlook problems efficiently. Take a look at the following instructions for smaller files that have been corrupted, or large files you want to prevent from corrupting. Outlook has a location where you can manually add approved email addresses to the Safe Senders list and ensure they never Outlook Fix resource center end up in your junk mail. The indexing feature is essentially a catalogue that is built from all of the information you receive in your email.

However, like any software, Outlook isn’t immune to issues. Just as your files can easily become corrupted, so can your Outlook profile. This usually happens when you've switched versions of Outlook but your profile did not update. Sometimes when a user tries to search in Outlook, it either returns incomplete results, or returns nothing at all, even if you can see the email normally. Most times, this is caused by a corrupted search index, which you can rebuild.

If you're having problems sending or receiving email, read how to Fix Outlook.com email sync issues. The maximum number of recipients for an individual email through USNH IT mail servers is 300. If you try to send to more than 300 recipients in a single send, you will get an error similar to "This message wasn't delivered to anyone because there are too many recipients. The limit is 300." No matter how well written add-ins are (and even Outlook itself), there will always be the occasional Outlook problem that doesn’t seem to go away or may not be related to add-ins at all. You can read how to fix your Outlook problem on the internet, but sometimes the suggestions don’t work for your specific case.

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Reference: delorishovell4/8165194#8