Windows – How to stop Outlook 2010 from blue-underlining all text in read messages

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For some reason only some HTML-formatted emails I receive get blue-underlined like this screenshot.
This problem is not with the original message, since my co-workers do not have this underline and I see can such messages normally for a couple of seconds and then see as Outlook progressively adds underlines to each word. This underline is the same style as "incorrect syntax" when composing a new message or in Word.
How do I turn this off for the incoming messages?

Example

Best Answer

While other answers were helpful in directing me to the final solution, ultimately this option was in another location. Settings in MS Word have no relation here at all.

Outlook -> Outlook Options -> Mail -> Editor Options -> Advanced -> Disable "Mark formatting inconsistencies".

Outlook options

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