1 I cant start Microsoft Outlook or receive the error Cannot start Microsoft Outlook Cannot open the Outlook Window
Denese Manske edited this page 2026-01-14 10:00:36 +08:00

Try accessing other websites to confirm that the issue is specific to Outlook Web. Start typing in the search box to find a contact or contact list. Right-click an existing folder and select Create Fix Outlook Site new subfolder. Calendar events can be used for your own personal event, or you can invite others to create an in-person or Teams meeting. To find the item with the attachment, scan the list of items in the thread.

If you would like a deeper explanation or step-by-step instructions, scroll down to the section covering your issue Fix Outlook Site for more details. If you're committed to the task of Outlook troubleshooting in the meantime, let's get into our guide that will help you solve some of the most annoying Outlook issues. The classic Outlook consistently failed with CAA2000B or 4usqa, depending on the account state. However, when signing in using the new Outlook app, everything worked. Outlook sign-in failures started appearing in multiple tenants without any obvious cause.

These files can be repaired through an inbuilt program in the Outlook installation directory. If everything is working correctly, you can now delete the old profile. When you face issues related to the Outlook profile stuck on loading, there might be some hardware issues. So, make sure you turn off the hardware acceleration option in Outlook. To create a user profile, you must first create a user account.

Or how about customizing the look and feel of your mailbox? To effortlessly change your settings so that your inbox looks the way you want it to, see Personalize your new Mail experience in Outlook.com. New features like Files and attachment previews let you see your pictures and files Fix Outlook Site without leaving your inbox. And now you can add emojis and GIFs to your messages. You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in Outlook.com as additional accounts in the Outlook profile. To access the calendar shared with your Microsoft 365 for business account, you'll need to accept the invitation from Outlook on the web, iOS, or Android.

If the network is performing slowly, Outlook must wait for read and write operations to the AppData directory to finish. We recommend that you move several items in your larger folders to separate folders, or that you archive those items by using the AutoArchive feature. Make sure that the latest updates for Outlook are installed. For more information, see How Fix Outlook Site to install the latest applicable updates for Microsoft Outlook (US English only). For more information, see Support for Office 2016 and 2019 clients connecting to Microsoft 365 services has ended. Running the /resetnavpane command removes all customizations to the navigation pane.

If Outlook is NOT able to start in safe mode, then try the next proposed solution below, entitled Create a new Outlook profile. Starting Outlook in safe mode, which starts Outlook without add-ins loaded, can tell you if an add-in is the source of the problem. Try these troubleshooting steps in the order presented here, from simple to more complicated.

So, to enable the permissions, follow the steps below. Outlook Web App or OWA is a web version of Microsoft Outlook that you can use for free. Because it is available online, users can Fix Outlook Site easily access their account from any device, even from their smartphone.

Starting Outlook in safe mode, which starts Outlook without add-ins loaded, can tell you if an add-in is the source of the problem. Turn off all the add-ins, close Outlook, and reopen it (not in Safe Mode). If it opens correctly, you can enable the add-ins one by one. After turning on each one, close and reopen Outlook to see if it loads correctly. It will help pinpoint the troublesome add-in you can remove or replace.

When you select a specific day in the calendar, any appointment or event scheduled for that day is listed in this area. You also can select a day or time slot and create a new appointment or event. Select More to see additional actions—for example, an option to print a message.

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, wait a short time (usually two or three minutes) to see if Outlook starts working again. You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in Outlook.com as additional accounts in the Outlook profile. 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.

You can automatically repair your Office program files to resolve such problems as Outlook freezing or not responding. To manage your mailbox by reducing the size of the Outlook data file, see Reduce the size of Outlook Data Files (.pst and .ost). Many of these items can be automatically checked by the Classic Outlook Advanced Diagnostics troubleshooter.