Should you decide to remove a profile, back up the data files first. All offline cached content will be deleted when you choose Remove. For more information, see Introduction to Official Fix Outlook guide Outlook Data Files (.pst and .ost). A corrupted profile, a damaged PST file, faulty add-ins, or improper Outlook startup settings often cause this issue.

If you can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook. If the troubleshooter can't fix your issue, or if you'd like to fix it yourself, see the next section.

Starting Outlook in Safe Mode will prevent some or all add-ins from being loaded, prevents several settings files from being loaded and turns off the Reading Pane. 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. When reaching this point of the guide, the issue most likely also occurs for other users on the computer. This means that the issue is not caused by a configuration setting but by an Official Fix Outlook guide installation error.

Please install the latest updates on your phone to resolve the issue. Then, each item in your calendar folder is checked for known problems that can cause unexpected behavior, such as meetings that seem to be missing. See and manage the tasks in the selected list from this window. Right-click a task for a list of options, or select a task to see and manage its details. Add a contact to your Favorites by selecting a contact in the list, and then selecting Add to favorites.

Your profile stores a variety of settings that control Official Fix Outlook guide how Outlook looks and feels. You can create a new profile and then add your email accounts to the new profile. If repairing your Microsoft 365 programs didn't resolve your issue, move on to the next step. If installing the latest updates didn't resolve your issue, move on to the next step. For example, the first time you try to Dismiss All on a list of reminders, Outlook asks you if you're sure you want to do that. If you don't choose an option on that dialog box, Outlook won't let you do anything else.

If Outlook is unresponsive, not opening, or is crashing without any morning you can repair using the tried and tested methods provided here. Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running. If so, Official Fix Outlook guide wait a short time (usually two or three minutes) to see if Outlook starts working again. The steps to access the repair tool vary depending on your operating system.

It empowers you to identify recoverable data and restore it to a usable state within Outlook, giving you a much better chance of retrieving your critical information. When the search is over, select one of the files from the list in the central part of the search panel and click the OK button. The path to selected file will be displayed in the address field of Recovery Toolbox for Outlook. If you want to sign in and encounter the situation that your email doesn’t exist, it means your account was deleted before 60 days (about 2 months) or more. In such a case, you can contact the Microsoft support agent to recover deleted accounts. Before talking to a Microsoft agent, be prepared for account-related queries and credentials.

Solutions to Troubleshoot 'Out of Memory or System Resources' ErrorCheck Resource Usage. ...Restart and Update Outlook. ...Optimize System Resources for Outlook. ...Find and Remove Faulty Add-ins from Outlook. ...Increase the Size of the Memory Heap. ...Rebuild the OST File.Apr 7, 2025

For more information about when builds are available for their respective channels, go to Update history for Microsoft 365. We're investigating the issue and will update this page when a fix is available. If you're using Outlook 2010, Outlook 2013 or Outlook 2016, uninstall and re-install iCloud to resolve this issue. 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.

To sum up, we explored several methods to fix "Outlook won’t open" errors. Whether it’s a profile issue, a corrupted PST file, or faulty add-ins, the methods above can help you get Outlook running again. When Microsoft Outlook refuses to open, it’s incredibly frustrating. This issue often stems from common culprits like a corrupted user profile, a damaged data file (PST or OST), or even a minor conflict within its settings or add-ins.

This is a lightweight app designed to handle multiple accounts and fairly moderate email use. New features like Files and attachment previews let you see your pictures and files without leaving your inbox. If you manually type in the secondary connected account email address Official Fix Outlook guide 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 is the primary alias. While these Microsoft accounts work in other Microsoft products (e.g. OneDrive, Windows, Xbox), they are non-functional when visiting Outlook.com.