Wanted to share an issue we had with OWA (Android in particular) to save some time of others if end up in the same situation.

We had code an email that was working perfectly in all the email clients but had a particular issue with the Outlook Mobile App.
In there the links colors were not being respected, instead it was forced to the usual Blue link color from Outlook.

Our code looked like: 


    <p style="color:#ff1122;">
        <a href="http://litmus.com" style="text-decoration:none; color: #ff1122;">Hello World!</a>
    </p>

And that wasn't working, so after a lot of trial and error we discovered that the issue was comming from Outlook changing the colors if the containter and the inner tag were the same color :S

Using a code like this, worked just fine:


    <p>
        <a href="http://litmus.com" style="text-decoration:none; color: #ff1122;">Hello World!</a>
    </p>

Same as this one:


    <p style="color:#ffffff;">
        <a href="http://litmus.com" style="text-decoration:none; color: #ff1122;">Hello World!</a>
    </p>

I can't say exactly why, but so far is the only solution that worked for us (we tried with !important and many other options).

So basically having different colors for the outter and inner tags will make the trick.

Hope it helps, and very welcome other solutions!