I get quite a few complaints from people who say their fonts are tiny (or huge) or the font used for the reply shrinks yet Microsoft Outlook shows they are using a normal size font (such as 10 or 12 pt).
This is caused by the zoom setting. The easiest fix is to hold Ctrl as you roll the mouse wheel (this is the likely cause for many people).
Keyboarders can use the Ctrl and plus (+) or minus (-) keys to change the zoom level in increments or Ctrl and the zero (0) key to go to 100%. You can also click the Zoom button and set it back to 100%.
You can also use the Zoom button on the ribbon. Click it to open the zoom dialog and select the desired zoom level.
Outlook 2010 (and Outlook 2013) have a zoom slider in the main Outlook window status bar (under the To-Do bar on the right side). Use this slider to adjust the zoom in the reading pane. If you prefer, you can click on the zoom % (100% in the screenshot) to open the zoom dialog.
Many times when you make the change to a message you are composing and send it, the next message you compose reverts to the goofy zoom setting. This is because making changes to a message then sending the message applies the changes to that message only. If you make the changes then close the message, it should apply the changes to all future messages.
Note that changing the zoom setting is not persistent for reading messages. To make the zoom level persistent, you need to use an add-in or a macro. A list of zoom tools is in the Tools Section and you'll find a macro on page 2: Macro to set the zoom level
The "zoom problem" generally affects only messages you compose. If you are receiving messages with huge letters and the font size is large (e.g., 100 pt), see Help! My Fonts are Huge!
When composing message, zoom is always on
When zoom is stuck on a value (usually a tiny font), you can reset it by changing the zoom level then closing, but not sending, the message. If you change the zoom level then send, the change applies only to the message you changed, not to future messages.
- Open a new message
- Click the Zoom button on the ribbon
- Change the zoom to the desired level
- Close the message.
- Click new message (or reply) and the zoom should be the desired level.
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ZoomIn can save your preferred Outlook email zoom setting.