Nice graph.<p>I found a small error, the entry about Microsoft Lync is wrong. It started as<p>Microsoft NetMeeting [1] &amp; Windows Messenger [2] =&gt; Microsoft Office Communicator [3] =&gt; Microsoft Lync [3] =&gt; Microsoft Skype (Business) [3]<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Netmeeting" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Netmeeting</a><p>[2] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Windows_Messenger" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Windows_Messenger</a><p>[3] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Microsoft_Lync" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Microsoft_Lync</a>