Hello, we have some users who are having this issue. Was there a proper resolution to this yet?

Thank you

Microsoft told me this is a bug in the current O365 release and should be fixed in the next patch.

As a workaround, they gave me a registry key to deploy and it has worked for all users that have received it. I did not have to make the users enable the Microsoft exchange add-in as it was already enabled in our environment by default.

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\Options\CalendarAdd: ShowLegacyRoomFinder with dword value 1

Here is the PowerShell script i used for deployment in case anyone needs it:

Set variables to indicate value and key to set

$RegistryPath = 'HKCU:\Software\Microsoft\Office\16.0\Outlook\Options\Calendar'

$Name = 'ShowLegacyRoomFinder'

$Value = '1'

Create the key if it does not exist

If (-NOT (Test-Path $RegistryPath)) {

New-Item -Path $RegistryPath -Force | Out-Null

}

Now set the value

New-ItemProperty -Path $RegistryPath -Name $Name -Value $Value -PropertyType DWORD -Force

You can deployed it via GPO as well

Here is the article with details.
https://support.microsoft.com/en-us/office/how-to-revert-the-outlook-desktop-webview-based-room-finder-to-the-legacy-room-finder-e872b6f2-0d36-41ff-861d-adaab2da9c28#:~:text=How%20to%20revert%20the%20Outlook%20Desktop%20WebView%20based,Close%20Registry%20Editor%20and%20restart%20Outlook.%20See%20More.

Do we know if a fix has been released?

Thanks

As of build Microsoft® Outlook® for Microsoft 365 MSO (Version 2211 Build 16.0.15831.20098) 64-bit this issue no longer affects the calendar selection... Now every time we open the outlook desktop app, it launches the web version. This is happening immediately the Outlook Desktop app is opened.

As of build Microsoft® Outlook® for Microsoft 365 MSO (Version 2211 Build 16.0.15831.20098) 64-bit this issue no longer affects the calendar selection... Now every time we open the outlook desktop app, it launches the web version. This is happening immediately the Outlook Desktop app is opened.

Out of 15 users, I have one experiencing the browser opening when she starts her Outlook Desktop app (we never experienced the calendar issue). It's very consistent in that she can open/close Outlook and it happens every time. It's like a behind-the-scenes login process that's being displayed with no login prompts, just the animated mail icon you might see after successfully loggin in. She's been getting it for many weeks now. We're on the same version (Version 2211 Build 16.0.15831.20098). I've attached the browser URL that's displays at that time. The obfuscation is her login account.