This is for an .oft specific template only.

The dreaded blue line is showing up in my litmus test and every fix I've tried to implement has failed.

HTML:

<a id="outlookLink" x-apple-data-detectors="true" href="#" target="_blank" style="text-decoration: none; color: #666666"><span class="emailLink" style="text-decoration: none; color: #666666"><font style="text-decoration: none; color: #666666; text-decoration: none !important; color: #666666 !important">link.com</font></span></a>

CSS fixes I've tried implementing:

<!--[if gte mso 9]>
<style>
a:link, a:visited, a, a:link, a:visited, a:focus, a:hover, a:active, span.MsoHyperlink {
mso-style-priority:100 !important;
color:#666666 !important;
color:#666666;
text-decoration:none !important;
}
body a{
text-decoration:none;
text-decoration-color: #666666;
text-decoration-color: #666666 !important;
}

outlookLink {text-decoration: none; color: #666666 !important}

a:-webkit-any-link {
color: inherit !important;
text-decoration: none;
}
</style>
<![endif]-->

<style>
a:link, a:visited, span.MsoHyperlink {
mso-style-priority:100 !important;
color:#000000 !important;
color:#000000;
text-decoration:none !important;
}
a:-webkit-any-link {
color: inherit !important;
text-decoration: none;
}
</style>

These fixes take care of almost all outlook clients, except Outlook 11, all gmail devices before 7.0, iOS device. They all show the text-decoration-color as blue.

Again this is an .oft, when I inspect the OWA version I can see it stripping the <a> tag of inline styles.

I have the following meta tags:
<meta content="telephone=no" name="format-detection">
<meta name="format-detection" content="telephone=no, address=no, email=no, date=no">

Also using:
[x-apple-data-detectors], / iOS */
.unstyle-auto-detected-links *,
.aBn {
border-bottom: 0 !important;
cursor: default !important;
color: #inherit !important;
text-decoration: none !important;
font-size: inherit !important;
font-family: inherit !important;
font-weight: inherit !important;
line-height: inherit !important;
}

span.MsoHyperlinkFollowed { mso-style-priority:99; color:inherit; }
span.MsoHyperlink {
mso-style-priority: 99;
color: #666666;
text-decoration: none;
}

Help anyone? I've tried almost every solution I can find on the forumns.