The principle of Microsoft application security

Write 1000 words that respond to the following questions:
<ul>
<li>Describe the principle of Microsoft application security.?</li>
<li>How to secure key Microsoft client and server applications?</li>
<li>What best practice for securing Microsoft Windows applications are?</li>
</ul>
Respond to at least 2 of your fellow classmates with at least a 100-word reply.

Please note:
<ul>
<li>Be in APA format including your references.</li>
<li>Be 1000 words long (not including title and references).</li>
<li>Do not re-state the questions.</li>
<li>Include two sources (i.e. two references).</li>
<li>Respond to at least two of your fellow classmates.</li>
</ul>