If you are unable to connect or are prompted for your password repeatedly attempt the following options. After finishing one step, if it does not resolve the issue move on to the next. Most Outlook problems can be resolved with proper troubleshooting and maintenance.

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Message 2 - The file you're attaching is bigger than the server allows. Step 2 - Follow these instructions to install your Office application. Step 1 - Follow these instructions to uninstall your Office applications. TrustedTech is a Microsoft solutions Partner in the following areas. We love reading your suggestions on new features and feedback about how you use our products!

Unable to add email addresses in Safari

If you need to increase the number of this limit try the next resolution. Step 1 - The hard limit of recipients for a single email message is 300. Reduce the number of recipients for a single email to less than 300.

Unable to send to Gmail with country domains

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. This fix will also lead to a reduction in the total number of contacts on your contact list. 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. To help you get rid of these duplicates, we have released a fix which will automatically clean up your contact list.

Issue - Too many recipients in Outlook

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. Most of these crashes come down to one thing – problematic data files. When they get too large, go corrupt, or are poorly configured, things start to break. 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.





Conflicting rules can prevent certain rules from working as intended. Review your rules to identify any conflicts and resolve them by disabling or adjusting overlapping rules. Currently, you can't use Outlook on Windows to edit calendars that are shared with your Outlook.com 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.

• Many businesses depend on it to keep their operations running, and having it break is a nightmare that usually ends up costing lots of money and causing a lot of frustration.
• Not something you want to take on lightly, but sometimes you have to.
• Fortunately, with the right Outlook troubleshooting strategies, many of the most common Outlook problems are quite straightforward to troubleshoot.
• 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.
• To edit a shared calendar, go online to your own Outlook.com calendar, open Calendar for Windows 10, or use a mobile device.

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. If Outlook shows an error like "Cannot open attachments", this could be due to unsupported file formats, outdated Outlook versions, corrupted attachments, or security restrictions. If you are having issues sending email, this might be due to validation issues with your Microsoft Account.



Configure your antivirus software to exclude Outlook files or processes from real-time scans to avoid interference. Microsoft Outlook is one of the most widely used email clients globally, especially in professional and business environments. Outlook also comes with strong built-in security features, making it a reliable choice for managing communication and workflow. Some customers may not be able to see their Profile, Account or Sign Out options when selecting their picture on the top toolbar. If you access your Outlook.com account through the iOS Mail app, you may be repeatedly asked to enter your username and password. Microsoft has released a Windows Hotfix file to remove the contacts folder synced by the Teams app.

If you're having problems sending or receiving email, read how to Fix Outlook.com email sync issues. You might need to set Windows Update to automatically download and install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below. These features are fully compatible with Outlook.com and Hotmail accounts, and you can try them for free on any device.

Uninstall and reinstall the new Outlook for Windows

Here’s how to disable add-ins in Outlook even when it keeps crashing. However, like any software, Outlook isn’t immune to issues. When you try to accept a shared Outlook.com calendar using your Microsoft 365 for Outlook not receiving emails solution business account in Outlook 2016, you might receive the "Something went wrong" error or your sign-in might fail. To edit a shared calendar, go online to your own Outlook.com calendar, open Calendar for Windows 10, or use a mobile device.