Please follow below roundabout method to change the default email template in Outlook.

1. In the Mail view, click Home > New Email to create a new email. Compose the new email, and then click File > Save As.

2. In the opening Save As dialog box, please do as follows: (1) Open the stationery folder with pasting the address of %appdata%\microsoft\stationery into to the Address box and pressing the Enter key; (2) Type a name for the new stationery in the File name box; (3) Select HTML from the Save as type drop down list; (4) Click the Save button.

So far, you have created a custom stationery in Outlook. Please close the new email.

3. Click File > Options to open the Outlook Options dialog box.

4. In the Outlook Options dialog box, click Mail in the left bar, and then click the Stationery and Fonts button under the Compose messages section. See screenshot:

5. Now the Signatures and Stationery dialog box comes out, please click the Theme button. See screenshot:

6. In the popping out Theme or Stationery dialog box, click to select the new created stationery in the Choose a Theme list box, and click the OK buttons successively to close all dialog boxes.

From now on, when you click Home > New Email to create a new email in Outlook, the specified stationery will be applied to the new email automatically.

One click to change default zoom levels of Message reading, composing, and replying windows in Outlook

With the Enable auto zoom (percent) in read, compose and reply window option of Kutools for Outlook, you can quickly change the default zoom lever of all message reading windows, composing message windows, and replying/forwarding message windows by one click!