You can easily change or format font of the selected text or the whole message body when composing a new email, or replying/forwarding an email in Outlook.

1. In the message body, select the text whose font you will change.
Tips: If you need to change the font in the whole message body, please put cursor in the message body, and then press Ctrl + A keys to select the whole message body.

2. Go to the Font group on the Format Text tab, and click the specified buttons to format font as you need.

• Font: Click the Font drop-down list, and pick up a new font from the Font drop-down list. Alternatively, you can type the font name in the Font box and press Enter key directly.
• Font size: Click the Font Size drop-down list, and 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.
• Increase Font size: Click the Increase Font Size button  to increase slightly the font size of selected text.
• Decrease Font Size: Click the Decrease Font Size button  to decrease slightly the font size of selected text.
• Bold: Click the Bold button  to bold selected text in message body.
• Italic: Click the Italic button to italicize selected text in the message body.
• Underline: Click the Underline button to add underline for the selected text.
• Strikethrough: Click the Strikethrough button  to add strikethrough across selected text.
• Subscript: Click the Subscript button  to shrink the selected text to very small letter under the line of text.
• Superscript: click the Superscript button  to shrink the selected text above the line of text
• Text highlight color: Click the Text Highlight Color button , and pick up a highlight color for the selected text.
• Font color: Select a color from the Font Color drop down list to set font color for selected text.
• Change case: Click the Change Case button and select one of options to change to uppercase, lowercase, sentence case, or others.
• Half width & full width: Click Change Case > Half-width or Full-width as you need to convert selected text between half-width and full-width.
• Character shading: Click the Character Shading button  to add the gray background for the current selected text.
• Character border: Click the Character Border button to add a solid black border around the selected text.
• Phonetic Guide: Click the Phonetic Guide button  , then in the Phonetic Guide dialog review the ruby text for each character, change the ruby text, and format the alignment, offset, font, or font size of the ruby text in the corresponding boxes as you need.
  
• Clear all formatting: Click the Clear All Formatting button to clear all formatting from selected text.

You can also use hotkeys to format the font of selected text in the message body when composing new emails or replying/forwarding emails in Outlook.

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

1. Select the text whose font you will change in the message body.
Tips: To change the font in the whole message body, please select the whole message body with 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, you can configure as you need:

3.1 Change Font

In the Font dialog, please select a new font from the Font drop-down list, and click the OK button.

3.2 Font Size

select or enter a font size in the Size list box, and click the OK button.

3.3 Italic or Bold

In the Font dialog, enable the Font tab, click to highlight Italic or Bold in the Font style list box, and click the OK button.

3.4 Underline

In the Font dialog, enable the Font tab, and then:
(1) Select an underline style from the Underline style drop-down list;
(2) If you need to color the underline, please select a color from the Underline color drop-down list.
(3) Click the OK button.

3.5 Strikethrough & Double Strikethrough

In the Font dialog, enable the Font tab, tick the Strikethrough option or Double Strikethrough option as you need, and click the OK button.

3.6 Superscript & Subscript

In the Font dialog, enable the Font tab, tick the Superscript or Subscript options as you need, and click the OK button.

3.7 Font Color

In the Font dialog, enable the Font tab, and click the box below Font color and select a color from the drop-down list, and finally click the OK button.

3.8 Small caps & All caps

In Font dialog, enable the Font tab, tick the Small caps or All caps options as you need, and click the OK button.

If you tick the Small caps option in the Font dialog, all letters in the selected text will be changed to uppercase, and the first letter in each sentence will be bigger then others. See screenshot:

If you tick the All caps option in the Font dialog, all letters in the selected text will be change to uppercase in the same font size. See screenshot:

3.9 Emphasis mark

In the Font dialog, enable the Font tab, select the emphasis mark from the Emphasis mark drop-down list, and click the OK button.

3.10 Hidden Text

In the Font dialog, enable the Font tab, and check the Hidden option in the Effects section, and click the OK button.

3.11 Character Spacing

3.11.1 Scale

The Scale option can stretch or compress the selected text horizontally to adjust the character spacing. If the scale percentage is greater than 100%, it will stretch the characters horizontally; and it will compress the characters when the scale percentage is less than 100%.

Click the Scale box and then select a percentage from the drop-down list.
Tips: you can preview the selected text with new character spacing in the Preview section of the Font dialog.

3.11.2 Spacing

The Spacing option will expand or condense spaces between characters in the selected text. If you choose expanded spacing, the space between characters will be bigger, while condense spacing will make the selected text tight.

Click the Spacing box, select Expanded or Condensed from the drop-down list as you need, and enter the number of points you want to expand or condense in the By box.
Tips: you can preview the selected text with new character spacing in the Preview section of the Font dialog.

3.11.3 Position

The Position Option can move up or down the selected characters by the specified number of points.

Click the Position box, select Raised or Lowered from the drop-down list, and then specify the number of points in the right By box.

After you click the OK button to save the settings, you will see the selected characters are raised or lowered by the specified number of points.

3.11.4 Kern for fonts

The Kern for fonts option can adjust the spaces between special pairs of characters, says “Te”, and make the spaces between these special characters similar visually.

Tick the Kerning for fonts option, and specify a font size in the Points and above box.