Using classic Outlook for Windows in business environments
Hi Jim,
In classic Outlook for Windows, you can change the font color only when composing or editing a message. If you want to change the font color of an opened received email, unfortunately, classic Outlook does not let you permanently change the sender’s message formatting while reading it. You would need to select Actions > Edit Message, if available, and then change the text color. Or you can reply/forward the message and format the text in your response.
Hope this will help. Should you have any other questions, please feel free to share them in the comments on this post. I'm happy to assist you further.