Things changed on February 1st, 2024 when Google and Yahoo started applying new email sender standards in an attempt to improve their users’ experience. Even with the correct SMTP details, the server might be down or malfunctioning. Understanding the specific error codes returned by the SMTP server can help diagnose the issue. Mistyped usernames or passwords can prevent successful authentication with your SMTP server, leading to failed email sends. 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 will ensure that all information is retained and only contacts with matching information in all fields will be cleaned up. To check if you have received the fix, review your contact list to confirm duplicates have been removed. Add an Outlook.com alias to your account and send email to Gmail users using that alias.
Microsoft has released a Windows Hotfix file to remove the contacts folder synced by the Teams app. Some Safari users are unable to add email addresses in the To section, or cannot point the cursor in the To field. Check if your domain is validated according to the new rules of Gmail and Yahoo that will come into effect in 2024. For more detailed information, read our article on SMTP ports.
If you are experience performance issues for Exchange Public Folders or Outlook Shared Mailboxes then we would recommend that you review this blog post. Pretty sure this is just a normal occurrence for Outlook between mobile and desktop version. There isn’t really much of anything you can change in order to speed up the desktop version.
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 steps to fix Outlook not opening invitation will need to remove your permissions and then send a new invitation. Availability has recovered, and engineers are investigating the root cause and identifying problematic servers.
After October 14, 2025, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows 10. Your PC will still work, steps to fix Outlook not opening but we recommend moving to Windows 11.
You can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors. Are you having trouble starting Outlook or receiving "Cannot start Microsoft Outlook. Cannot open the Outlook window" error messages? We can fix the problem for you, or you can use the troubleshooting steps we're providing below to help resolve these startup issues. If your Outlook is working fine now, it means add-ins are the culprit. But it is important to identify the specific add-in that was causing trouble. To identify that, check the add-ins one at a time and restart Outlook.
Sometimes you send an email and discover later that it is not delivered to the intended recipient. By following this checklist, you can systematically troubleshoot and resolve most common email sending issues. If you typically use an Outlook.com account for email, this issue can occur if there are multiple aliases on the account and the 3rd party email address is the primary alias. Customers with only a 3rd party email address set up as the username of their Microsoft Account will be asked to add a 1st party Microsoft alias to their account before accessing Outlook.com.
We have multiple tools to help you automatically diagnose an issue, troubleshoot, and fix problems with Outlook. If Startup Repair detects any of these issues, it will attempt to fix them automatically. If it cannot fix the problem, it will provide a detailed report of the issues it found.
If you want to fix PST files using this tool, make sure to have a proper backup of the Outlook PST before processing. Simran Bhatia is a technical content writer engaged in writing clear, concise, and SEO-optimized content. With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms. However, in some cases, the Inbox Repair tool (SCANPST) fails to repair the PST file. Opt for a better alternative tool such as a professional PST Repair Tool. Microsoft Outlook, like any other software on Windows, encounters several errors.
The team is sweeping all remaining capacity to identify and address residual issues. While these Microsoft accounts work in other Microsoft products (e.g. OneDrive, Windows, Xbox), they are non-functional when visiting Outlook.com. Outlook.com (the web version of Outlook) and Outlook apps require a 1st party alias (Outlook/Hotmail/Live/MSN) to send and receive email, use calendar, etc.
If you upgraded from Outlook 2003 to Outlook 2007, some people have reported that reseting a few internal Outlook files helps with performance. Microsoft has identified several issues with a recent Outlook updated (KB ). To access the filtering options faster, add them to your Quick Access Toolbar. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure. When you try to accept a shared Outlook.com calendar using your Microsoft 365 for business account in Outlook 2016, you might receive the "Something went wrong" error or your sign-in might fail.