When I only Select email message in Inbox outlook make it as read without opening it because of the Outlook reading pane feature. To Stop this feature follow below step.

When I only Select email message in Inbox outlook make it as read without opening it because of the Outlook reading pane feature. To Stop this feature follow below step.

1. Go to Tools tabs in outlook

 

2. Select option

3. click on Other Tab - Select Reading Pane

4 Than Uncheck all three option

 

5 Click on OK

Restart Outlook than check it works or not.

This is by defaulf option you have to remove it to disable this feature.