You can change the font size of the selected text in a composing, replying, or forwarding email as easily as that in Microsoft Word.

1. In the message body, please select the text whose font size you will change.
Tips: You can easily select the whole message body with putting cursor in the message body and pressing Ctrl + A keys together.

2. Pick up a number from the Font Size drop-down list.
By the way, you can also type in a number in the Font Size box and press Enter key to change the font size directly.

Now the font size of the selected text is changed.

Sometimes, you may just need to change the font size slightly. In this situation, you can change the font size of the selected text with the Increase Font Size button or Decrease Font Size button easily.

• Select the text whose font size you want to increase slightly, and click the Increase Font Size button  in the Font group on the Format Text tab (or Basic Text group on the Message tab);
• Select the text whose font size you want to decrease slightly, and click the Decrease Font Size button  in the Font group on the Format Text tab (or Basic Text group on the Message tab);
• Select the text whose font size you want to change, and press Ctrl + Shift + > to increase slightly, or press Ctrl + Shift + < to decrease slightly.

Alternatively, you can also change the font size of the selected text with the Font dialog. Please do as follows:

1. In the message body, select the text whose font size you need to change.
Tips: You can easily select the whole message body with placing the cursor in the message body and pressing Ctrl + A keys together.

2. Click the anchor  at the bottom-right corner of Font group on the Format Text tab (or Basic Text group on the Message tab) to opens the Font dialog.

Tips: You can also open the Font dialog with pressing the Ctrl + D keys together.

3. In the Font dialog, please select or enter a font size in the Size list box, and click the OK button.

Now the font size of the selected text changes.

1. The Font Size drop-down list, Increase Font Size button, and Decrease Font Size button will be gray and invalid on the Ribbon until you place the cursor in the message body.

2. Methods introduced in this article can only change font size of the selected text in the current message. To change the default font size of message body, you need to configure the stationery.