Hi @W. Dayton,
This is a fairly recent occurrence. Also my client is visually impaired and uses hi contrast mode on her windows 11 pc.
Is there any change made on her pc right prior to the occurrence of this issue? Like any recent update has been applied to either the Windows OS or Office applications?
Any difference if the user sends the message out via the web mail?
Could you perhaps collect the detailed version information for both Windows and Outlook?
Based on your description, I tried testing on my end by turning on the Contrast mode on Windows 11 but cannot reproduce the issue. The text is still shown as black on white background on the receiver's side:
The version information of my Windows and Outlook is as follows
In order to help narrow down if it's related to the contrast mode, it's suggested to try temporarily turning off the contrast mode or switching to a different contrast theme and check if the issue persists.
Besides, I'd recommend checking for and applying all available updates for both OS and Office and see if there would be any improvement.
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