This article is designed to describe how to set Office365 as Default App for specific user while other users use OpenOffice via GPO

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Instructions

Steps for setting Group Policies based on different Organizational Units (OU) to specify default applications for users:
1. Open "AD Users and Computers" and right-click on the domain. Create a new OU called "Common Users". 2. Drag and drop the users who should have OpenOffice set as the default application from the "Users" container to the newly created OU (Note: Make sure to drag and drop the actual user accounts, not just the groups, as policies won't be applied to groups alone). 3. Open "GPO Management" and select the "Common Users" OU. Create a new GPO named "Openoffice". 4. Right-click on the created group policy and choose "Edit". Navigate to "User Configuration" > "Preferences" > "Control Panel Settings" > "Folder Options". Right-click on "Folder Options" and select "New" > "Open With". 5. Configure the default application for the .xlsx file format. 6. Repeat the same steps to configure specific users to use Office 365 as the default application.
7. Run "gpupdate /force" in the command prompt on the domain controller and server to update the group policies.
8. Log in to the server using a user account and run "gpresult /r" in the command prompt to check if the policies have been successfully applied.