New Outlook windows won't open

Hello Willow.Alvarez, Thank you for contacting Microsoft community. I'd like to let you know this is a peer-to-peer support forum meaning I'm just fellow regular MS forum users like you who are trying to help other MS forum users with their issues. I'm a Non-Microsoft Staff I don't have access to your account, nor I'm authorized to do so. I’m sorry to hear that you’re experiencing issues with Outlook after the upgrade. Here are some steps you can try: Investigate Add-ins: Exit Outlook. Press Windows logo key + R to open a Run dialog box. Enter Outlook /safe, choose a profile if prompted, and then select OK. If Outlook doesn’t crash or hang, continue by selecting File > Options > Add-Ins. At the bottom of the window, select COM Add-ins and then select Go. Clear any active check boxes and then select OK. Restart Outlook. If the issue doesn’t recur, start adding the add-ins back one at a time. After adding each add-in, exit, and re-open Outlook. If the issue doesn’t recur, add the next add-in. Repeat until either all add-ins have been re-added, or the issue recurs. If it recurs, remove the last add-in added. Repair Office: Type “Control Panel” in the search box at the bottom of the Windows screen. Select “Uninstall a program” from the Programs group. Right-click the entry for your Microsoft 365 installation and then select Change > Online Repair. Create a New Outlook Profile: Type “Control Panel” in the search box at the bottom of the Windows screen. Select “User Accounts” > “Mail.” Select “Show Profiles.” Remove the profile you want to replace. Add a new profile with your username and primary SMTP address. When prompted, enter your sign-in credentials. When the setup is finished, select Finish. If you want to revert back to Old version of the calendar app Unistall New outlook To uninstall the new Outlook app from Windows, use these steps: Open the Start menu and click the gear-shaped icon to open the Settings app. Use the left pane to switch to the Apps tab and click on Installed apps. Select Uninstall again to confirm. Once you remove the app, you will be able to use the old version of calendar app on your PC like before Regards Ruth

I have a similar problem. The "NEW" outlook has never opened. The classic version still functions are expected.

All I get is the following error message:

"It looks like the webpage at https://outlook.office.com/mail/?nativeVersion=1.2024.821.200&sessionId={GUID} might be having issues, or it may have moved permanently to a new web address."

About 10-15 seconds after this error message appears Microsoft Edge crashes and has to restart.

I have uninstalled and reinstalled, tried the repair & reset options, but it still will not open.

I have three devices experiencing the same issue. Two Win11 devices & one Win10 device. All three have different ISP.

Screenshot of error: