UAC pop up Exchange activesync policies broker after Windows 10 update

My Surface Pro 3 is running Windows 10 Pro with version 1709, and recently the tablet has upgraded to the Cumulative update v1803. After I log into my desktop, the User Account Control always pops up “Do you want to allow this app to make changes to your PC” dialog box. It refers to Exchange Active Sync Policies Broker, but I never install this program. That happens during my normal use or wake up from sleep mode. How can I resolve the problem?

The Exchange Active Sync Policies Broker is controlled by UAC. You could change the Security Level to lower or running off the UAC. However, it is not an acceptable option, and here are some useful tips.

The Windows 10 built-in Mail app causes the annoying pop up issue. Then switching to a third party Mail manager.
* From your desktop, right click on the Start menu, and select
“Windows PowerShell (Admin)” from menu.
* Type the command below and press Enter to execute it:

Get-AppxPackage *microsoft.windowscommunicationsapps* | Remove-AppxPackage

It will uninstall the Mail and calendar apps completely.
* Then go to install the Outlook software or other Mail manager.

If you don’t want to do that, open the mail app, click on a gear icon at the bottom > Manage Accounts, and check if any email account is associated to Outlook. Then delete it from the list.

Your Microsoft account might sync setting with any corporate databases.Open the Settings app, go to Accounts > sync your settings, and move the little blue of SYNC SETTINGS to turn it off. You can also switch to a local Account instead of a Microsoft Account.

Make changes with Registry editor
* Press Win + R from your keyboard, type regedit into Run dialog box, and click OK button.
* Within the left pane of Registry editor, expand the HKEY_LOCAL_MACHINE, and go to the sub-tree below:

\SOFTWARE\Microsoft\Windows NT\CurrentVersion\UAC\COMAutoApprovalList 

* On its right pane, check if a REG_DWORD Registry entry called {C39FF590-56A6-4253-B66B-4119656D91B4} has the value data of 1.
* Go to another tree:


and make sure the value of Elevation key is set to 1.


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