This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 32%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBB%3C/text%3E%3C/svg%3E)
I tried running
Set-CASMailbox -Identity xxxx -OneWinNativeOutlookEnabled $false
to disable employee access to New Outlook, but it did not work. According to the Microsoft guide (https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/enable-disable-employee-access-new-outlook#enable-or-disable-the-outlook-desktop-new-outlook-toggle), this command should work. Any suggestions on how to resolve this issue?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(137.6, 20%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMH%3C/text%3E%3C/svg%3E)
Hi,
Welcome to the Microsoft Q&A forum!My understanding is that after waiting for a while, the setting will be able to take effect successfully to prohibit employees from accessing New Outlook, right? I am glad that your problem has been solved. If you have any other questions, you can always contact us.
Sorry I was too fast. it takes few minutes then it get affected.