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diff --git a/html/images/sogo/sogo.icalendar.5.add.a.caldav.account.png b/html/images/sogo/sogo.icalendar.5.add.a.caldav.account.png
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diff --git a/html/index.html b/html/index.html
index 4a9b26bf..75c62e18 100644
--- a/html/index.html
+++ b/html/index.html
@@ -33,6 +33,7 @@
 <h3 id="configure-mail-client-applications">Configure mail client applications</h3>
 <ul>
 <li><a href="configure.thunderbird.html">Configure Thunderbird as mail client (POP3/IMAP, SMTP and global ldap address book)</a></li>
+<li><a href="sogo.icalendar.html">Add calendar account in iCalendar on Mac OS X</a></li>
 </ul>
 <h3 id="how-to">How to</h3>
 <ul>
diff --git a/html/sogo.icalendar.html b/html/sogo.icalendar.html
new file mode 100644
index 00000000..dc0d5eb8
--- /dev/null
+++ b/html/sogo.icalendar.html
@@ -0,0 +1,47 @@
+<html>
+    <head>
+        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+        <title>Add calendar account in iCalendar on Mac OS X</title>
+        <link href="./css/markdown.css" rel="stylesheet"></head>
+    </head>
+    <body>
+    
+    <div id="navigation">
+        <a href="http://www.iredmail.org" target="_blank">iRedMail web site</a>
+    
+        // <a href="./index.html">Document Index</a>
+    </div><h1 id="add-calendar-account-in-icalendar-on-mac-os-x">Add calendar account in iCalendar on Mac OS X</h1>
+<blockquote>
+<p>To use calendar service (CalDAV protocol), you must choose to install
+SOGo groupware during iRedMail installation.</p>
+</blockquote>
+<p>1: Open application <code>System Preferences</code>:</p>
+<p><img alt="" src="./images/sogo/sogo.icalendar.1.system.preferences.png" /></p>
+<p>2: Click <code>Internet Accounts</code>:</p>
+<p><img alt="" src="./images/sogo/sogo.icalendar.2.internet.accounts.png" /></p>
+<p>3: on right panel, click <code>Add Other Account</code> at the bottom</p>
+<p><img alt="" src="./images/sogo/sogo.icalendar.3.add.other.account.png" /></p>
+<p>4: choose <code>Add a CalDAV account</code> in popup window</p>
+<p><img alt="" src="./images/sogo/sogo.icalendar.4.choose.account.type.png" /></p>
+<p>5: Fill up the form with your server address and email account credential</p>
+<ul>
+<li>Account Type: <code>Advanced</code></li>
+<li>User Name: <code>your full email address</code></li>
+<li>Password: <code>password of your email account</code></li>
+<li>Server Address: <code>server name or IP address</code></li>
+<li>Server Path: <code>/SOGo/dav/[your full email address]</code></li>
+<li>Port: <code>443</code></li>
+<li>Use SSL: checked</li>
+</ul>
+<p><img alt="" src="./images/sogo/sogo.icalendar.5.add.a.caldav.account.png" /></p><p style="text-align: center; color: grey;">Document published under a <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">CC BY-ND 3.0</a> license. If you found something wrong, please do <a href="http://www.iredmail.org/contact.html">contact us</a> to fix it.<!-- Google Analytics -->
+<script type="text/javascript">
+    var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
+    document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
+</script>
+<script type="text/javascript">
+    try {
+        var pageTracker = _gat._getTracker("UA-3293801-14");
+        pageTracker._trackPageview();
+    } catch(err) {}
+</script>
+</body></html>
\ No newline at end of file
diff --git a/mua/sogo.icalendar.md b/mua/sogo.icalendar.md
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+++ b/mua/sogo.icalendar.md
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+# Add calendar account in iCalendar on Mac OS X
+
+> To use calendar service (CalDAV protocol), you must choose to install
+> SOGo groupware during iRedMail installation.
+
+1: Open application `System Preferences`:
+
+![](./images/sogo/sogo.icalendar.1.system.preferences.png)
+
+2: Click `Internet Accounts`:
+
+![](./images/sogo/sogo.icalendar.2.internet.accounts.png)
+
+3: on right panel, click `Add Other Account` at the bottom
+
+![](./images/sogo/sogo.icalendar.3.add.other.account.png)
+
+4: choose `Add a CalDAV account` in popup window
+
+![](./images/sogo/sogo.icalendar.4.choose.account.type.png)
+
+5: Fill up the form with your server address and email account credential
+
+* Account Type: `Advanced`
+* User Name: `your full email address`
+* Password: `password of your email account`
+* Server Address: `server name or IP address`
+* Server Path: `/SOGo/dav/[your full email address]`
+* Port: `443`
+* Use SSL: checked
+
+![](./images/sogo/sogo.icalendar.5.add.a.caldav.account.png)
