The main purpose of Basic Authentication in Outlook is to allow users to save credentials when it is being used against a server. However, if you want to prevent users from saving credentials for Basic Authentication in Outlook, here is how you can do that. For your information, both are almost the same, and they can be configured via Local Group Policy Editor and Registry Editor.

How to prevent Outlook from saving credentials for Basic Authentication
To configure saving credentials for Basic Authentication in Outlook, follow these steps:
- Search for gpedit.msc in the Taskbar search box.Click on the search result.Go to Account Settings > E-mail in User Configuration.Double-click on Prevent saving credentials for Basic Authentication policy setting.Select the Enabled option.Click the OK button.
To learn more about these steps, continue reading.
First, you need to open the Local Group Policy Editor. For that, you can search for gpedit.msc or gpedit in the Taskbar search box and click on the individual search result.
Then, navigate to this path:
User Configuration > Administrative Templates > Microsoft Outlook 2016 > Account Settings > E-mailHere you can find a setting named Prevent saving credentials for Basic Authentication policy. You need to double-click on this setting and choose the Enabled option to prevent users from saving credentials for the Basic Authentication policy.

On the other hand, if you want to opt for the original setting, you need to choose the Disabled or Not Configured option.
At last, click the OK button and restart the Outlook app.
How to configure saving credentials for Basic Authentication in Outlook using Registry
To configure saving credentials for Basic Authentication in Outlook using Registry, follow these steps:
- Press Win+R and type regedit in the box.Click the OK button and click on the Yes button.Navigate to Microsoftoffice16.0 in HKCU.Right-click on 0 > New > Key and name it as outlook.Right-click on outlook > New > Keyand name it as rpc.Right-click on rpc > New > DWORD (32-bit) Value.Set the name as disablebasicauthsavedcreds.Double-click on it to set the Value data as 1.Click the OK button.Restart your computer.
Let’s find out more about these steps to know more.To get started, press Win+R to display the Run prompt. Then, type regedit, and click the OK button. If the UAC prompt appears on your screen, you need to click on the Yes button to open the Registry Editor on your computer.Next, you need to navigate to the following path:
HKEY_CURRENT_USERSoftwarePoliciesMicrosoftoffice16.0
Right-click on 16.0 > New > Key and name it outlook. Then, right-click on the outlook key, select New > Key, and set the name as rpc.

Once done, you need to create a REG_DWORD value. For that, right-click on rpc > New > DWORD (32-bit) Value and name it disablebasicauthsavedcreds.


How do I stop Outlook from remembering my credentials?
To stop Outlook from remembering your credentials, you can go through the aforementioned steps. You need to open the Local Group Policy Editor and go to Microsoft Outlook 2016 > Account Settings > E-mail. Double-click on the Prevent saving credentials for Basic Authentication policy and choose the Enabled option. Finally, click the OK button and restart the Outlook app.
