As suggested in it, I've tried Item.Save method, but it doesn't seem to do anything except closing the edited message with original subject. Select Main Tabs from the dropdown menu below Customize the Ribbon. The Options dialog box will display on-screen. Click on the File tab and select Options. Now, I've found this thread but a) it s over 6 years old and b) points to forum that doesn't exist anymore. Launch the Microsoft Word application on your computer. user hasn't clicked 'reply' button) the macro works fine changing the topic in the message list. What is even more interesting if the message is selected but not edited (i.e. Problem is in the fact that while in the first case the macro works as expected, in the second the subject is not changed (even while I can see it changing while debugging the code). The IF statement is my attempt to cover the bases: user can either edit the email in the pop-up window, when the ActiveInpector is set or user can edit it in the reading pane - when the ActiveExplorer.Selection is set. StrSubject = 'Confidential and Legally Privileged ' & strSubject In this 5-minute Developer-focused demo, hear about Mailbox 1.10 APIs and Event-based Add-ins that are GA on the new Outlook for Mac Ashima Mathur shows viewers the new 1.10 Signature APIs to over-ride native signature and stamp the add-in defined signature on mail canvas. ' Prefix subject with Confidential and Legally Privileged The tab is turned off by default in Microsoft Office, but you can learn how to set it up in a breeze. StrSubject = Replace(strSubject, 'Confidential and Legally Privileged ', '') The best way to access the VBA developer environment, is the so-called Developer tab. ' Remove previous Confidential and Legally Privileged Set oInspector = Application.ActiveInspector Following this thread I've managed to came up with this: Public Sub Confidential() I am trying to create a button-controlled macro that would change the topic of an email message.

Outlook 2016 show developer tab