How to allow in-cell editing in Outlook folders?

To edit an email in the mail folder directly, you can enable the Allow in-cell editing option as follows:

1. Select the folder where you want to allow in-cell editing, and click View > View Settings. See screenshot:

2. In the opening Advanced View Settings dialog box, please click the Other Settings button. See screenshot:

3. Now the Other Settings dialog box comes out, please check the Allow in-cell editing option, and click the OK buttons successively to close both dialog boxes.

4. Now you return to the folder, please go ahead to click View > Reading Pane > Off to turn off the reading pane. See screenshot:

From now on, when clicking at the subject of one email, you will see the subject is editable. See screenshot:

Note: It recommends to turn off the conversation view (with unchecking the Show as Conversation option on the View tab) when you are in-cell editing in an Outlook folder.

Change/edit subject lines of received messages in Outlook