Your problem lies in this piece of code:
<script type="script/x-kendo-template" id="inboxItem">
<h3 class="time">#: Time#</h3><h3>#: From #</h3>
<h2>#: Subject#</h2>
<p><div id="myAnchor">#: Text#</div></p>
</script>
Please see the documentation here.
You could make an easy fix for it by making the following change:
<script type="script/x-kendo-template" id="inboxItem">
<h3 class="time">#: Time#</h3><h3>#: From #</h3>
<h2>#: Subject#</h2>
<p><div id="myAnchor">#= Text#</div></p>
</script>
But that would leave a possible XSS vulnerability open. I would suggest doing the following:
<script type="script/x-kendo-template" id="inboxItem">
<h3 class="time">#: Time#</h3><h3>#: From #</h3>
<h2>#: Subject#</h2>
<p><div id="myAnchor">#: Text##= HTML#</div></p>
</script>
Then just add an HTML variable to your JSON object solely for rendering raw HTML data.
Had to do a little bit of research on this as I have absolutely no experience with this kendo framework. Hope it helps!