Is there any idea in place to allow users to create a section within the outlook email message?
Or is there a similar capability?
Welcome to our forum!
In order to better understand your issue, what do you want to create the tab for？
Are the tabs you're talking about in the custom ribbon? If in this case, you can refer to the steps:
Select File > Options > Customize Ribbon.
To add a new tab to the ribbon, select New Tab.
To add a custom group to a tab, select the tab you want to add a group to, and then select New Group.
To add commands to a custom group, select the group. Then, in the Choose commands from list, select a command and select Add.
When you’re finished, select OK.
if that is not your case, according to my search, I found a similar thread.
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