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6000steps-to-fix-outlook-not-opening
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Opened Sep 28, 2025 by Margareta Sayers@margaretasayer
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Resolve Outlook for Windows issues with automated troubleshooting tools

Availability has recovered, and engineers are investigating the root cause and identifying problematic servers. The team is sweeping all remaining capacity to identify and address residual issues. Customers with only a 3rd party email address set up as the username of their Microsoft Account will be asked to Fix Outlook troubleshooting hub add a 1st party Microsoft alias to their account before accessing Outlook.com.

However, if you want to change your password with your email provider, you'll need to visit their website or help desk, or contact your email administrator. For example, if you have a Yahoo! account, you first have to change your password at Yahoo.com. Once you've changed your password with your email provider, you can update the password in Outlook. See Change or update your email password for more information.

The person who sent you the invitation will need to remove your permissions and then send a new invitation. 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. Outlook supports sending from a secondary connected account for Microsoft owned domains such as @outlook.com, @live.com, @hotmail.com but has not implemented this functionality for third-party domains. 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. 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 Fix Outlook troubleshooting hub is the primary alias.

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. If you're still unable to send or receive email, read how to Fix Outlook.com email sync issues. Some customers may experience a delay when trying to create a new email address, or alias, for their Outlook.com account. If you're having problems sending Fix Outlook troubleshooting hub or receiving email, read how to Fix Outlook.com email sync issues.

If you need to increase the number of this limit try the next resolution. The maximum number of recipients for an individual email through USNH IT mail servers is 300. Step 1 - Follow these instructions to uninstall your Office applications. 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. You might need to set Windows Update to automatically download and install recommended updates.

Reduce the number of recipients for a single email to less than 300. We have multiple tools to help you automatically diagnose an issue, troubleshoot, and fix problems with Outlook. We love reading your suggestions on new features and feedback about how you use our products!

Start classic Outlook in safe modeIn Windows 10, click Start.Type Outlook /safe, in the Search programs and files and then click OK.Close and re-open Outlook.If the issue is resolved, you can keep working, or if you have time, take the following steps to find out what COM Add-in is causing the problem.

We are aware that some users may not be able to receive email from Gmail accounts. 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 Fix Outlook troubleshooting hub Favorites. This issue has been fixed for Outlook.com country domains.

To resolve this Outlook issue, you can follow our comprehensive guide on How to Fix Outlook Search When Not Working. In case your Outlook PST is corrupt or damaged, you can always look for third-party Outlook PST Repair Tool to fix the issue. Inbox Repair Tool or ScanPST.exe Fix Outlook troubleshooting hub is a free utility provided by Microsoft. However, for severely corrupted PST files, it’s recommended to use a third-party repair tool.

After you remove messages or attachments from your mailbox, the PST file size will not necessarily reduce by itself. In order to shrink the size of the PST file, you need to compact it. Disabling unnecessary plugins is a great way to make your Outlook start faster, run more reliably, take less memory. In Outlook 2003 there are three places to look for installed addins and to disable them. The issues documented in this section have been reported after installing the recent updates listed below.

Depending on the answers, you could possibly skip large portions of this guide or even directly get a solution to your startup issue. Either disable caching or reduce the cache from unlimited, 12 months or whatever it is, to 3-6 months, all other data, the user would have to click ‘access on server’ or some other similar verbiage. 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.

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Reference: margaretasayer/6000steps-to-fix-outlook-not-opening#10