diff --git a/data/web/autodiscover.php b/data/web/autodiscover.php
new file mode 100644
index 000000000..92328e7f9
--- /dev/null
+++ b/data/web/autodiscover.php
@@ -0,0 +1,152 @@
+<?php
+require_once 'inc/vars.inc.php';
+require_once 'inc/functions.inc.php';
+if(file_exists('inc/vars.local.inc.php')) {
+  include_once 'inc/vars.local.inc.php';
+}
+
+error_reporting(0);
+
+$data = trim(file_get_contents("php://input"));
+
+// Desktop client needs IMAP, unless it's Outlook 2013 or higher on Windows
+if (strpos($data, 'autodiscover/outlook/responseschema')) { // desktop client
+  $autodiscover_config['autodiscoverType'] = 'imap';
+  if ($autodiscover_config['useEASforOutlook'] == 'yes' &&
+  // Office for macOS does not support EAS
+  strpos($_SERVER['HTTP_USER_AGENT'], 'Mac') === false &&
+  // Outlook 2013 (version 15) or higher
+  preg_match('/(Outlook|Office).+1[5-9]\./', $_SERVER['HTTP_USER_AGENT'])) {
+    $autodiscover_config['autodiscoverType'] = 'activesync';
+  }
+}
+
+$dsn = $database_type . ":host=" . $database_host . ";dbname=" . $database_name;
+$opt = [
+  PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+  PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+  PDO::ATTR_EMULATE_PREPARES   => false,
+];
+$pdo = new PDO($dsn, $database_user, $database_pass, $opt);
+$login_user = strtolower(trim($_SERVER['PHP_AUTH_USER']));
+$login_role = check_login($login_user, $_SERVER['PHP_AUTH_PW']);
+
+if (!isset($_SERVER['PHP_AUTH_USER']) OR $login_role !== "user") {
+  header('WWW-Authenticate: Basic realm=""');
+  header('HTTP/1.0 401 Unauthorized');
+  exit(0);
+}
+else {
+  if (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
+    if ($login_role === "user") {
+      header("Content-Type: application/xml");
+      echo '<?xml version="1.0" encoding="utf-8" ?>' . PHP_EOL;
+?>
+<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
+<?php
+      if(!$data) {
+        list($usec, $sec) = explode(' ', microtime());
+?>
+  <Response>
+    <Error Time="<?=date('H:i:s', $sec) . substr($usec, 0, strlen($usec) - 2);?>" Id="2477272013">
+      <ErrorCode>600</ErrorCode>
+      <Message>Invalid Request</Message>
+      <DebugData />
+    </Error>
+  </Response>
+</Autodiscover>
+<?php
+        exit(0);
+      }
+      $discover = new SimpleXMLElement($data);
+      $email = $discover->Request->EMailAddress;
+
+      if ($autodiscover_config['autodiscoverType'] == 'imap') {
+?>
+  <Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
+    <User>
+      <DisplayName><?=$displayname;?></DisplayName>
+    </User>
+    <Account>
+      <AccountType>email</AccountType>
+      <Action>settings</Action>
+      <Protocol>
+        <Type>IMAP</Type>
+        <Server><?=$autodiscover_config['imap']['server'];?></Server>
+        <Port><?=$autodiscover_config['imap']['port'];?></Port>
+        <DomainRequired>off</DomainRequired>
+        <LoginName><?=$email;?></LoginName>
+        <SPA>off</SPA>
+        <SSL><?=$autodiscover_config['imap']['ssl'];?></SSL>
+        <AuthRequired>on</AuthRequired>
+      </Protocol>
+      <Protocol>
+        <Type>SMTP</Type>
+        <Server><?=$autodiscover_config['smtp']['server'];?></Server>
+        <Port><?=$autodiscover_config['smtp']['port'];?></Port>
+        <DomainRequired>off</DomainRequired>
+        <LoginName><?=$email;?></LoginName>
+        <SPA>off</SPA>
+        <SSL><?=$autodiscover_config['smtp']['ssl'];?></SSL>
+        <AuthRequired>on</AuthRequired>
+        <UsePOPAuth>on</UsePOPAuth>
+        <SMTPLast>off</SMTPLast>
+      </Protocol>
+      <Protocol>
+        <Type>CalDAV</Type>
+        <Server>https://<?=$mailcow_hostname;?>/SOGo/dav/<?=$email;?>/Calendar</Server>
+        <DomainRequired>off</DomainRequired>
+        <LoginName><?=$email;?></LoginName>
+      </Protocol>
+      <Protocol>
+        <Type>CardDAV</Type>
+        <Server>https://<?=$mailcow_hostname;?>/SOGo/dav/<?=$email;?>/Contacts</Server>
+        <DomainRequired>off</DomainRequired>
+        <LoginName><?=$email;?></LoginName>
+      </Protocol>
+    </Account>
+  </Response>
+<?php
+      }
+      else if ($autodiscover_config['autodiscoverType'] == 'activesync') {
+        $username = trim($email);
+        try {
+          $stmt = $pdo->prepare("SELECT `name` FROM `mailbox` WHERE `username`= :username");
+          $stmt->execute(array(':username' => $username));
+          $MailboxData = $stmt->fetch(PDO::FETCH_ASSOC);
+        }
+        catch(PDOException $e) {
+          die("Failed to determine name from SQL");
+        }
+        if (!empty($MailboxData['name'])) {
+          $displayname = utf8_encode($MailboxData['name']);
+        }
+        else {
+          $displayname = $email;
+        }
+?>
+  <Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/mobilesync/responseschema/2006">
+    <Culture>en:en</Culture>
+    <User>
+      <DisplayName><?=$displayname;?></DisplayName>
+      <EMailAddress><?=$email;?></EMailAddress>
+    </User>
+    <Action>
+      <Settings>
+        <Server>
+        <Type>MobileSync</Type>
+        <Url><?=$autodiscover_config['activesync']['url'];?></Url>
+        <Name><?=$autodiscover_config['activesync']['url'];?></Name>
+        </Server>
+      </Settings>
+    </Action>
+  </Response>
+<?php
+      }
+?>
+</Autodiscover>
+<?php
+    }
+  }
+}
+?>