diff --git a/docs/README b/docs/README
--- a/docs/README
+++ b/docs/README
@@ -23,12 +23,12 @@
 1. Apache
 
 # for https://domain.tld (and https://autodiscover.domain.tld)
-Alias /autodiscover/autodiscover.xml /usr/share/kolab-autodiscover/public_html
-Alias /Autodiscover/Autodiscover.xml /usr/share/kolab-autodiscover/public_html
-Alias /AutoDiscover/AutoDiscover.xml /usr/share/kolab-autodiscover/public_html
+Alias /autodiscover/autodiscover.xml /usr/share/kolab-autodiscover/public_html/index.php
+Alias /Autodiscover/Autodiscover.xml /usr/share/kolab-autodiscover/public_html/index.php
+Alias /AutoDiscover/AutoDiscover.xml /usr/share/kolab-autodiscover/public_html/index.php
 # for http://autoconfig.domain.tld
-Alias /mail/config-v1.1.xml /usr/share/kolab-autodiscover/public_html
+Alias /mail/config-v1.1.xml /usr/share/kolab-autodiscover/public_html/index.php
 # for http://domain.tld
-Alias /.well-known/autoconfig/mail/config-v1.1.xml /usr/share/kolab-autodiscover/public_html
+Alias /.well-known/autoconfig/mail/config-v1.1.xml /usr/share/kolab-autodiscover/public_html/index.php
 
 2. Add [autodiscover] section in /etc/kolab/kolab.conf (see sample kolab.conf.sample)
diff --git a/docs/kolab-autoconf.conf b/docs/kolab-autoconf.conf
--- a/docs/kolab-autoconf.conf
+++ b/docs/kolab-autoconf.conf
@@ -1,11 +1,19 @@
+# Force all requests to lowercase. Different MUAs, mobile devices etc
+# request the Autodiscover URL in different cases.
+RewriteEngine On
+RewriteMap lc int:tolower
+RewriteCond %{REQUEST_URI} !^/Microsoft
+RewriteCond %{REQUEST_URI} [A-Z]
+RewriteRule (.*) ${lc:$1} [R=301,L]
+
 # for https://domain.tld (and https://autodiscover.domain.tld)
-Alias /autodiscover/autodiscover.xml /usr/share/kolab-autoconf/public_html
-Alias /Autodiscover/Autodiscover.xml /usr/share/kolab-autoconf/public_html
-Alias /AutoDiscover/AutoDiscover.xml /usr/share/kolab-autoconf/public_html
+Alias /autodiscover/autodiscover.xml /usr/share/kolab-autoconf/public_html/index.php
+
 # for http://autoconfig.domain.tld
-Alias /mail/config-v1.1.xml /usr/share/kolab-autoconf/public_html
+Alias /mail/config-v1.1.xml /usr/share/kolab-autoconf/public_html/index.php
+
 # for http://domain.tld
-Alias /.well-known/autoconfig/mail/config-v1.1.xml /usr/share/kolab-autoconf/public_html
+Alias /.well-known/autoconfig/mail/config-v1.1.xml /usr/share/kolab-autoconf/public_html/index.php
 
 <Directory "/usr/share/kolab-autoconf/public_html">
     AllowOverride None
diff --git a/lib/AutodiscoverMicrosoft.php b/lib/AutodiscoverMicrosoft.php
--- a/lib/AutodiscoverMicrosoft.php
+++ b/lib/AutodiscoverMicrosoft.php
@@ -52,12 +52,22 @@
         // parse XML
         try {
             $xml = new SimpleXMLElement($post);
+	    Log::debug(print_r($xml, true));
 
-            if ($email = $xml->xpath('/Autodiscover/Request/EMailAddress')) {
+	foreach($xml->getDocNamespaces() as $strPrefix => $strNamespace) {
+	    if(strlen($strPrefix)==0) {
+		$strPrefix="a"; //Assign an arbitrary namespace prefix.
+	    }
+	    $xml->registerXPathNamespace($strPrefix,$strNamespace);
+	}
+
+
+
+            if ($email = $xml->xpath('//a:EMailAddress')) {
                 $this->email = (string) array_shift($email);
             }
 
-            if ($schema = $xml->xpath('/Autodiscover/Request/AcceptableResponseSchema')) {
+            if ($schema = $xml->xpath('//a:AcceptableResponseSchema')) {
                 $schema = (string) array_shift($schema);
 
                 if (strpos($schema, 'mobilesync')) {