You cannot edit the message subject through Outlook

Applies to: Microsoft Outlook 2013 Service Pack 1Outlook 2016Outlook 2019


When you open a message in Outlook and click on the subject, the text cursor does not appears, making it impossible to edit the subject of the message.


This issue occurs when the message header is collapsed.

Outlook 2013 Service Pack 1 and newer versions can collapse the message header to compact the size of the message.


Expand the Outlook Infobar by clicking in the lower right arrow to expand the header for editing.

You cannot edit the message subject through Outlook

More Information

In Outlook 2013, the default behavior is the expanded header while Outlook 2016 the default behavior is collapsed header. When the header is collapsed, the subject field is NOT editable.

We can change the default behavior of the Outlook to always expand the header using the registry key below;

DWORD: MinimalHeaderOn
Value: 0

0 = expanded
1 = collapsed