diff --git a/html/install.iredmail.on.debian.ubuntu.html b/html/install.iredmail.on.debian.ubuntu.html
index e93b1db4..8cd5f2e3 100644
--- a/html/install.iredmail.on.debian.ubuntu.html
+++ b/html/install.iredmail.on.debian.ubuntu.html
@@ -41,7 +41,7 @@ and it may not be working as expected.</p>
 <ul>
 <li>A <strong>FRESH</strong>, working Debian/Ubuntu Linux. Supported releases are listed on
   <a href="../download.html">Download</a> page.</li>
-<li>At least <code>1 GB</code> of memory is required for low traffic production server.
+<li><code>2 GB</code> of memory is recommended for a low traffic production server.
   Spam/Virus scanning will take most system resource.</li>
 </ul>
 <p>Notes:</p>
diff --git a/html/install.iredmail.on.freebsd.html b/html/install.iredmail.on.freebsd.html
index 9a45a1df..4b3cf6cc 100644
--- a/html/install.iredmail.on.freebsd.html
+++ b/html/install.iredmail.on.freebsd.html
@@ -48,7 +48,7 @@ and it may not be working as expected.</p>
 <li>A <strong>FRESH</strong>, minimal, working FreeBSD system, no additional ports or binary
   packages were installed. Supported releases are listed on
   <a href="../download.html">Download</a> page.</li>
-<li>At least <code>1 GB</code> of memory is required for low traffic production server.
+<li><code>2 GB</code> of memory is recommended for a low traffic production server.
   Spam/Virus scanning will take most system resource.</li>
 </ul>
 <p>Note: All packages will be installed from ports tree.</p>
diff --git a/html/install.iredmail.on.openbsd.html b/html/install.iredmail.on.openbsd.html
index 3b875e25..1c50aaae 100644
--- a/html/install.iredmail.on.openbsd.html
+++ b/html/install.iredmail.on.openbsd.html
@@ -41,7 +41,7 @@ and it may not be working as expected.</p>
 <ul>
 <li>A <strong>FRESH</strong>, working OpenBSD system. Supported releases are listed on
   <a href="../download.html">Download</a> page.</li>
-<li>At least <code>1 GB</code> of memory is required for low traffic production server.
+<li><code>2 GB</code> of memory is recommended for a low traffic production server.
   Spam/Virus scanning will take most system resource.</li>
 <li>
 <p>Required OpenBSD installation file sets are (replace <code>[XX]</code> by the real
diff --git a/html/install.iredmail.on.rhel.html b/html/install.iredmail.on.rhel.html
index eecb56c9..18c97d1f 100644
--- a/html/install.iredmail.on.rhel.html
+++ b/html/install.iredmail.on.rhel.html
@@ -42,7 +42,7 @@ and it may not be working as expected.</p>
 <ul>
 <li>A <strong>FRESH</strong>, working RHEL or CentOS system. Supported releases are listed on
   <a href="../download.html">Download</a> page.</li>
-<li>At least <code>1 GB</code> of memory is required for low traffic production server.
+<li><code>2 GB</code> of memory is recommended for a low traffic production server.
   Spam/Virus scanning will take most system resource.</li>
 </ul>
 <h2 id="preparations">Preparations</h2>
diff --git a/html/upgrade.iredmail.0.9.2-0.9.3.html b/html/upgrade.iredmail.0.9.2-0.9.3.html
index 71be8968..a0b4fb29 100644
--- a/html/upgrade.iredmail.0.9.2-0.9.3.html
+++ b/html/upgrade.iredmail.0.9.2-0.9.3.html
@@ -18,6 +18,7 @@
 <li><a href="#general-all-backends-should-apply-these-steps">General (All backends should apply these steps)</a><ul>
 <li><a href="#update-etciredmail-release-with-new-iredmail-version-number">Update /etc/iredmail-release with new iRedMail version number</a></li>
 <li><a href="#upgrade-iredapd-postfix-policy-server-to-the-latest-170">Upgrade iRedAPD (Postfix policy server) to the latest 1.7.0</a></li>
+<li><a href="#upgrade-roundcube-webmail-to-the-latest-stable-release">Upgrade Roundcube webmail to the latest stable release</a></li>
 <li><a href="#optional-fixed-not-preserve-the-case-of-extension-while-delivering-message-to-mailbox">[OPTIONAL] Fixed: Not preserve the case of ${extension} while delivering message to mailbox</a></li>
 </ul>
 </li>
@@ -31,7 +32,7 @@
 <p>We provide remote upgrade service, check <a href="../support.html">the price</a> and <a href="../contact.html">contact us</a>.</p>
 </blockquote>
 <ul>
-<li>2015-06-09: [OPTIONAL] Fixed: Not preserve the case of ${extension} while delivering message to mailbox.</li>
+<li>2015-06-09: [OPTIONAL] Fixed: Not preserve the case of <code>${extension}</code> while delivering message to mailbox.</li>
 </ul>
 <h2 id="general-all-backends-should-apply-these-steps">General (All backends should apply these steps)</h2>
 <h3 id="update-etciredmail-release-with-new-iredmail-version-number">Update <code>/etc/iredmail-release</code> with new iRedMail version number</h3>
@@ -47,6 +48,9 @@ so that you can know which version of iRedMail you're running. For example:</p>
 <p>Please follow below tutorial to upgrade iRedAPD to the latest stable release:
 <a href="./upgrade.iredapd.html">How to upgrade iRedAPD-1.4.0 or later versions to the latest stable release</a></p>
 <p>Detailed release notes are available here: <a href="./iredapd.releases.html">iRedAPD release notes</a>.</p>
+<h3 id="upgrade-roundcube-webmail-to-the-latest-stable-release">Upgrade Roundcube webmail to the latest stable release</h3>
+<p>Please follow Roundcube official tutorial to upgrade Roundcube webmail to the
+latest stable release immediately: <a href="http://trac.roundcube.net/wiki/Howto_Upgrade">How to upgrade Roundcube</a></p>
 <h3 id="optional-fixed-not-preserve-the-case-of-extension-while-delivering-message-to-mailbox">[OPTIONAL] Fixed: Not preserve the case of <code>${extension}</code> while delivering message to mailbox</h3>
 <p>With iRedMail-0.9.2 and earlier releases, email sent to user
 <code>username+Ext@domain.com</code> (upper case <code>E</code>) will be delivered to folder
diff --git a/installation/0-install.iredmail.on.debian.ubuntu.md b/installation/0-install.iredmail.on.debian.ubuntu.md
index 92846195..d1ab8e4a 100644
--- a/installation/0-install.iredmail.on.debian.ubuntu.md
+++ b/installation/0-install.iredmail.on.debian.ubuntu.md
@@ -15,7 +15,7 @@ To install iRedMail on Debian or Ubuntu Linux, you need:
 
 * A __FRESH__, working Debian/Ubuntu Linux. Supported releases are listed on
   [Download](../download.html) page.
-* At least `1 GB` of memory is required for low traffic production server.
+* `2 GB` of memory is recommended for a low traffic production server.
   Spam/Virus scanning will take most system resource.
 
 Notes:
diff --git a/installation/0-install.iredmail.on.freebsd.md b/installation/0-install.iredmail.on.freebsd.md
index f07ae8f3..b245727d 100644
--- a/installation/0-install.iredmail.on.freebsd.md
+++ b/installation/0-install.iredmail.on.freebsd.md
@@ -20,7 +20,7 @@ To install iRedMail on FreeBSD, you need:
 * A __FRESH__, minimal, working FreeBSD system, no additional ports or binary
   packages were installed. Supported releases are listed on
   [Download](../download.html) page.
-* At least `1 GB` of memory is required for low traffic production server.
+* `2 GB` of memory is recommended for a low traffic production server.
   Spam/Virus scanning will take most system resource.
 
 Note: All packages will be installed from ports tree.
diff --git a/installation/0-install.iredmail.on.openbsd.md b/installation/0-install.iredmail.on.openbsd.md
index 3d766167..973ddbd5 100644
--- a/installation/0-install.iredmail.on.openbsd.md
+++ b/installation/0-install.iredmail.on.openbsd.md
@@ -15,7 +15,7 @@ To install iRedMail on OpenBSD, you need:
 
 * A __FRESH__, working OpenBSD system. Supported releases are listed on
   [Download](../download.html) page.
-* At least `1 GB` of memory is required for low traffic production server.
+* `2 GB` of memory is recommended for a low traffic production server.
   Spam/Virus scanning will take most system resource.
 * Required OpenBSD installation file sets are (replace `[XX]` by the real
   OpenBSD release number):
diff --git a/installation/0-install.iredmail.on.rhel.md b/installation/0-install.iredmail.on.rhel.md
index 2975c880..a3362a43 100644
--- a/installation/0-install.iredmail.on.rhel.md
+++ b/installation/0-install.iredmail.on.rhel.md
@@ -15,7 +15,7 @@ To install iRedMail on RHEL or CentOS Linux, you need:
 
 * A __FRESH__, working RHEL or CentOS system. Supported releases are listed on
   [Download](../download.html) page.
-* At least `1 GB` of memory is required for low traffic production server.
+* `2 GB` of memory is recommended for a low traffic production server.
   Spam/Virus scanning will take most system resource.
 
 ## Preparations
diff --git a/upgrade/0-upgrade.iredmail.0.9.2-0.9.3.md b/upgrade/0-upgrade.iredmail.0.9.2-0.9.3.md
index 7aea2c33..bc8b2ef3 100644
--- a/upgrade/0-upgrade.iredmail.0.9.2-0.9.3.md
+++ b/upgrade/0-upgrade.iredmail.0.9.2-0.9.3.md
@@ -8,7 +8,7 @@ __This is still a DRAFT document, do NOT apply it.__
 
 > We provide remote upgrade service, check [the price](../support.html) and [contact us](../contact.html).
 
-* 2015-06-09: [OPTIONAL] Fixed: Not preserve the case of ${extension} while delivering message to mailbox.
+* 2015-06-09: [OPTIONAL] Fixed: Not preserve the case of `${extension}` while delivering message to mailbox.
 
 ## General (All backends should apply these steps)
 
@@ -31,6 +31,11 @@ Please follow below tutorial to upgrade iRedAPD to the latest stable release:
 
 Detailed release notes are available here: [iRedAPD release notes](./iredapd.releases.html).
 
+### Upgrade Roundcube webmail to the latest stable release
+
+Please follow Roundcube official tutorial to upgrade Roundcube webmail to the
+latest stable release immediately: [How to upgrade Roundcube](http://trac.roundcube.net/wiki/Howto_Upgrade)
+
 ### [OPTIONAL] Fixed: Not preserve the case of `${extension}` while delivering message to mailbox
 
 With iRedMail-0.9.2 and earlier releases, email sent to user