After deploying some sharepoint lists using Group Policy via Microsoft Outlook 2016/Account Settings/SharePoint Lists
The Lists would not add unless the user had clicked Allow to this error :
Do you want to allow this website to open a program on your computer?
From: companyweb
Program: Microsoft Outlook
Address: stssync://sts/?ver=1.1&type=tasks&cmd=add-folder&base-url=http%3A%2F%2Fcompanyweb&list-url=%2FLists%2FTasks%2F&guid=%7Bcf8bbfb4%2D575b%2D4dce%2Da800%2D5b34ac1786f1%7D&site-name=Corporate%20Intranet&list-name=Tasks
This error can stopped being displayed by deploying the below reg key :
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\ProtocolExecute
Add Key stssync
In that Key Create a Dword : “WarnOnOpen”
For this to apply to All users on the machine apply to the Key’s below
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Internet Explorer\ProtocolExecute\stssync
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ProtocolExecute\stssync
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