diff --git a/howto/configure.thunderbird.md b/howto/configure.thunderbird.md
index 528c3386..42598853 100644
--- a/howto/configure.thunderbird.md
+++ b/howto/configure.thunderbird.md
@@ -10,7 +10,7 @@ To create a new mail account with Thunderbird, please click menu: `File -> New -
 
 Add your name, email address and password in this screen.
 
-![](./images/Thunderbird.new.mail.account.png "Thunderbird.new.mail.account.png")
+![](./images/thunderbird.new.mail.account.png "Thunderbird.new.mail.account.png")
 
 Click continue, it will detect IMAP and SMTP server automatically.
 
diff --git a/html/configure.thunderbird.html b/html/configure.thunderbird.html
index a538483c..c76be767 100644
--- a/html/configure.thunderbird.html
+++ b/html/configure.thunderbird.html
@@ -27,7 +27,7 @@
 <h2 id="create-new-mail-account">Create new mail account</h2>
 <p>To create a new mail account with Thunderbird, please click menu: <code>File -&gt; New -&gt; Mail Account</code>.</p>
 <p>Add your name, email address and password in this screen.</p>
-<p><img alt="" src="./images/Thunderbird.new.mail.account.png" title="Thunderbird.new.mail.account.png" /></p>
+<p><img alt="" src="./images/thunderbird.new.mail.account.png" title="Thunderbird.new.mail.account.png" /></p>
 <p>Click continue, it will detect IMAP and SMTP server automatically.</p>
 <p>Note:</p>
 <ul>
diff --git a/html/images/README b/html/images/README
deleted file mode 100644
index 8b137891..00000000
--- a/html/images/README
+++ /dev/null
@@ -1 +0,0 @@
-