When an outlook email message is opened the font size is correct, however, when reply is pressed the font changes size. The font also is incorrect when sending a new email.

Resolution:

Open an email, press reply, the text should now be to large or to small

Hold the ctrl key down while spinning the wheel on the mouse, the text should change size. Spin mouse till size is corrrect and press File->Save.

When email is re-opened for reply the font size should be correct. An alternative fix is to move the cursor into the email body and press the font button. Set value to 100%.

Paragraph Marks also display this behavoir. If they appear only when replying or sending new emails, Open an email reply, menu->Format text->press the paragraph marks button and then File Save.