diff --git a/apps/federatedfilesharing/lib/Controller/RequestHandlerController.php b/apps/federatedfilesharing/lib/Controller/RequestHandlerController.php
index e0985f9aef..a74342f118 100644
--- a/apps/federatedfilesharing/lib/Controller/RequestHandlerController.php
+++ b/apps/federatedfilesharing/lib/Controller/RequestHandlerController.php
@@ -148,7 +148,7 @@ class RequestHandlerController extends OCSController {
 			);
 			\OCP\Util::writeLog('files_sharing', 'shareWith after, ' . $shareWith, \OCP\Util::DEBUG);
 
-			if (!\OCP\User::userExists($shareWith)) {
+			if (!\OC::$server->getUserManager()->userExists($shareWith)) {
 				throw new OCSException('User does not exists', 400);
 			}
 
diff --git a/apps/files_sharing/tests/CacheTest.php b/apps/files_sharing/tests/CacheTest.php
index 5d5de433ee..c891f56f3d 100644
--- a/apps/files_sharing/tests/CacheTest.php
+++ b/apps/files_sharing/tests/CacheTest.php
@@ -66,8 +66,10 @@ class CacheTest extends TestCase {
 
 		$this->shareManager = \OC::$server->getShareManager();
 
-		\OC_User::setDisplayName(self::TEST_FILES_SHARING_API_USER1, 'User One');
-		\OC_User::setDisplayName(self::TEST_FILES_SHARING_API_USER2, 'User Two');
+
+		$userManager = \OC::$server->getUserManager();
+		$userManager->get(self::TEST_FILES_SHARING_API_USER1)->setDisplayName('User One');
+		$userManager->get(self::TEST_FILES_SHARING_API_USER2)->setDisplayName('User Two');
 
 		self::loginHelper(self::TEST_FILES_SHARING_API_USER1);
 
diff --git a/apps/user_ldap/lib/Access.php b/apps/user_ldap/lib/Access.php
index b84f5a38b3..43feeb4c1f 100644
--- a/apps/user_ldap/lib/Access.php
+++ b/apps/user_ldap/lib/Access.php
@@ -588,7 +588,7 @@ class Access extends LDAPUtility implements IUserTools {
 		// outside of core user management will still cache the user as non-existing.
 		$originalTTL = $this->connection->ldapCacheTTL;
 		$this->connection->setConfiguration(array('ldapCacheTTL' => 0));
-		if(($isUser && $intName !== '' && !\OCP\User::userExists($intName))
+		if(($isUser && $intName !== '' && !\OC::$server->getUserManager()->userExists($intName))
 			|| (!$isUser && !\OC::$server->getGroupManager()->groupExists($intName))) {
 			if($mapper->map($fdn, $intName, $uuid)) {
 				$this->connection->setConfiguration(array('ldapCacheTTL' => $originalTTL));
@@ -721,7 +721,7 @@ class Access extends LDAPUtility implements IUserTools {
 		//20 attempts, something else is very wrong. Avoids infinite loop.
 		while($attempts < 20){
 			$altName = $name . '_' . rand(1000,9999);
-			if(!\OCP\User::userExists($altName)) {
+			if(!\OC::$server->getUserManager()->userExists($altName)) {
 				return $altName;
 			}
 			$attempts++;
diff --git a/apps/user_ldap/tests/User_LDAPTest.php b/apps/user_ldap/tests/User_LDAPTest.php
index 3262a2360a..9911aa37e3 100644
--- a/apps/user_ldap/tests/User_LDAPTest.php
+++ b/apps/user_ldap/tests/User_LDAPTest.php
@@ -275,7 +275,11 @@ class User_LDAPTest extends TestCase {
 		$backend = new UserLDAP($access, $this->createMock(IConfig::class), $this->createMock(INotificationManager::class), $this->createMock(Session::class), $this->getDefaultPluginManagerMock());
 		\OC_User::useBackend($backend);
 
-		$result = \OCP\User::checkPassword('roland', 'dt19');
+		$user = \OC::$server->getUserManager()->checkPassword('roland', 'dt19');
+		$result = false;
+		if ($user !== false) {
+			$result = $user->getUID();
+		}
 		$this->assertEquals('gunslinger', $result);
 	}
 
@@ -285,7 +289,11 @@ class User_LDAPTest extends TestCase {
 		$backend = new UserLDAP($access, $this->createMock(IConfig::class), $this->createMock(INotificationManager::class), $this->createMock(Session::class), $this->getDefaultPluginManagerMock());
 		\OC_User::useBackend($backend);
 
-		$result = \OCP\User::checkPassword('roland', 'wrong');
+		$user = \OC::$server->getUserManager()->checkPassword('roland', 'wrong');
+		$result = false;
+		if ($user !== false) {
+			$result = $user->getUID();
+		}
 		$this->assertFalse($result);
 	}
 
@@ -295,7 +303,11 @@ class User_LDAPTest extends TestCase {
 		$backend = new UserLDAP($access, $this->createMock(IConfig::class), $this->createMock(INotificationManager::class), $this->createMock(Session::class), $this->getDefaultPluginManagerMock());
 		\OC_User::useBackend($backend);
 
-		$result = \OCP\User::checkPassword('mallory', 'evil');
+		$user = \OC::$server->getUserManager()->checkPassword('mallory', 'evil');
+		$result = false;
+		if ($user !== false) {
+			$result = $user->getUID();
+		}
 		$this->assertFalse($result);
 	}
 
@@ -629,7 +641,7 @@ class User_LDAPTest extends TestCase {
 			->willReturn($this->createMock(UserMapping::class));
 
 		//test for existing user
-		$result = \OCP\User::userExists('gunslinger');
+		$result = \OC::$server->getUserManager()->userExists('gunslinger');
 		$this->assertTrue($result);
 	}
 
@@ -656,7 +668,7 @@ class User_LDAPTest extends TestCase {
 			->willReturn($this->createMock(User::class));
 
 		//test for deleted user
-		\OCP\User::userExists('formerUser');
+		\OC::$server->getUserManager()->userExists('formerUser');
 	}
 
 	public function testUserExistsPublicAPIForNeverExisting() {
@@ -675,7 +687,7 @@ class User_LDAPTest extends TestCase {
 			}));
 
 		//test for never-existing user
-		$result = \OCP\User::userExists('mallory');
+		$result = \OC::$server->getUserManager()->userExists('mallory');
 		$this->assertFalse($result);
 	}
 
diff --git a/lib/private/Share/Share.php b/lib/private/Share/Share.php
index 193e0c1a27..5a88f57fb1 100644
--- a/lib/private/Share/Share.php
+++ b/lib/private/Share/Share.php
@@ -439,7 +439,7 @@ class Share extends Constants {
 				\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName), \OCP\Util::DEBUG);
 				throw new \Exception($message_t);
 			}
-			if (!\OC_User::userExists($shareWith)) {
+			if (!\OC::$server->getUserManager()->userExists($shareWith)) {
 				$message = 'Sharing %s failed, because the user %s does not exist';
 				$message_t = $l->t('Sharing %s failed, because the user %s does not exist', array($itemSourceName, $shareWith));
 				\OCP\Util::writeLog('OCP\Share', sprintf($message, $itemSourceName, $shareWith), \OCP\Util::DEBUG);
diff --git a/lib/private/legacy/json.php b/lib/private/legacy/json.php
index 7b3a1b6d9c..7bfc815ab2 100644
--- a/lib/private/legacy/json.php
+++ b/lib/private/legacy/json.php
@@ -118,7 +118,7 @@ class OC_JSON{
 	 * @suppress PhanDeprecatedFunction
 	 */
 	public static function checkUserExists($user) {
-		if (!OCP\User::userExists($user)) {
+		if (!\OC::$server->getUserManager()->userExists($user)) {
 			$l = \OC::$server->getL10N('lib');
 			OCP\JSON::error(array('data' => array('message' => $l->t('Unknown user'), 'error' => 'unknown_user' )));
 			exit;
diff --git a/lib/private/legacy/user.php b/lib/private/legacy/user.php
index 52ed1369c4..8f342281ad 100644
--- a/lib/private/legacy/user.php
+++ b/lib/private/legacy/user.php
@@ -58,13 +58,6 @@
  */
 class OC_User {
 
-	/**
-	 * @return \OC\User\Session
-	 */
-	public static function getUserSession() {
-		return OC::$server->getUserSession();
-	}
-
 	private static $_usedBackends = array();
 
 	private static $_setupedBackends = array();
@@ -176,7 +169,7 @@ class OC_User {
 		if ($uid) {
 			if (self::getUser() !== $uid) {
 				self::setUserId($uid);
-				$userSession = self::getUserSession();
+				$userSession = \OC::$server->getUserSession();
 				$userSession->setLoginName($uid);
 				$request = OC::$server->getRequest();
 				$userSession->createSessionToken($request, $uid, $uid);
@@ -210,7 +203,7 @@ class OC_User {
 
 			//setup extra user backends
 			self::setupBackends();
-			self::getUserSession()->unsetMagicInCookie();
+			\OC::$server->getUserSession()->unsetMagicInCookie();
 
 			return self::loginWithApache($backend);
 		}
@@ -234,25 +227,6 @@ class OC_User {
 		}
 	}
 
-	/**
-	 * Sets user display name for session
-	 *
-	 * @param string $uid
-	 * @param string $displayName
-	 * @return bool Whether the display name could get set
-	 */
-	public static function setDisplayName($uid, $displayName = null) {
-		if (is_null($displayName)) {
-			$displayName = $uid;
-		}
-		$user = \OC::$server->getUserManager()->get($uid);
-		if ($user) {
-			return $user->setDisplayName($displayName);
-		} else {
-			return false;
-		}
-	}
-
 	/**
 	 * Check if the user is logged in, considers also the HTTP basic credentials
 	 *
@@ -348,7 +322,7 @@ class OC_User {
 				return $uid;
 			}
 		} else {
-			$user = self::getUserSession()->getUser();
+			$user = \OC::$server->getUserSession()->getUser();
 			if ($user) {
 				return $user->getDisplayName();
 			} else {
@@ -376,25 +350,6 @@ class OC_User {
 		}
 	}
 
-	/**
-	 * Check if the password is correct
-	 *
-	 * @param string $uid The username
-	 * @param string $password The password
-	 * @return string|false user id a string on success, false otherwise
-	 *
-	 * Check if the password is correct without logging in the user
-	 * returns the user id or false
-	 */
-	public static function checkPassword($uid, $password) {
-		$manager = \OC::$server->getUserManager();
-		$username = $manager->checkPassword($uid, $password);
-		if ($username !== false) {
-			return $username->getUID();
-		}
-		return false;
-	}
-
 	/**
 	 * @param string $uid The username
 	 * @return string
@@ -450,31 +405,6 @@ class OC_User {
 		return $displayNames;
 	}
 
-	/**
-	 * check if a user exists
-	 *
-	 * @param string $uid the username
-	 * @return boolean
-	 */
-	public static function userExists($uid) {
-		return \OC::$server->getUserManager()->userExists($uid);
-	}
-
-	/**
-	 * checks if a user is enabled
-	 *
-	 * @param string $uid
-	 * @return bool
-	 */
-	public static function isEnabled($uid) {
-		$user = \OC::$server->getUserManager()->get($uid);
-		if ($user) {
-			return $user->isEnabled();
-		} else {
-			return false;
-		}
-	}
-
 	/**
 	 * Returns the first active backend from self::$_usedBackends.
 	 *
diff --git a/lib/private/legacy/util.php b/lib/private/legacy/util.php
index aaedd88a7f..ca7cc1dc5c 100644
--- a/lib/private/legacy/util.php
+++ b/lib/private/legacy/util.php
@@ -274,7 +274,7 @@ class OC_Util {
 			self::initLocalStorageRootFS();
 		}
 
-		if ($user != '' && !OCP\User::userExists($user)) {
+		if ($user != '' && !\OC::$server->getUserManager()->userExists($user)) {
 			\OC::$server->getEventLogger()->end('setup_fs');
 			return false;
 		}
diff --git a/lib/public/User.php b/lib/public/User.php
index fd39b103d6..2fdf540b95 100644
--- a/lib/public/User.php
+++ b/lib/public/User.php
@@ -115,30 +115,7 @@ class User {
 	 * @since 5.0.0
 	 */
 	public static function userExists($uid, $excludingBackend = null) {
-		return \OC_User::userExists($uid);
-	}
-	/**
-	 * Logs the user out including all the session data
-	 * Logout, destroys session
-	 * @deprecated 8.0.0 Use \OC::$server->getUserSession()->logout();
-	 * @since 5.0.0
-	 */
-	public static function logout() {
-		\OC::$server->getUserSession()->logout();
-	}
-
-	/**
-	 * Check if the password is correct
-	 * @param string $uid The username
-	 * @param string $password The password
-	 * @return string|false username on success, false otherwise
-	 *
-	 * Check if the password is correct without logging in the user
-	 * @deprecated 8.0.0 Use \OC::$server->getUserManager()->checkPassword();
-	 * @since 5.0.0
-	 */
-	public static function checkPassword( $uid, $password ) {
-		return \OC_User::checkPassword( $uid, $password );
+		return \OC::$server->getUserManager()->userExists($uid);
 	}
 
 	/**
diff --git a/settings/users.php b/settings/users.php
index 20b9e21d58..03523fc530 100644
--- a/settings/users.php
+++ b/settings/users.php
@@ -62,12 +62,17 @@ if ($config->getSystemValue('sort_groups_by_name', false)) {
 	}
 }
 
-$isAdmin = OC_User::isAdminUser(OC_User::getUser());
+$uid = \OC_User::getUser();
+$isAdmin = OC_User::isAdminUser($uid);
 
-$isDisabled = !OC_User::isEnabled(OC_User::getUser());
+$isDisabled = true;
+$user = $userManager->get($uid);
+if ($user) {
+	$isDisabled = !$user->isEnabled();
+}
 
 $groupsInfo = new \OC\Group\MetaData(
-	OC_User::getUser(),
+	$uid,
 	$isAdmin,
 	$groupManager,
 	\OC::$server->getUserSession()
diff --git a/tests/lib/TestCase.php b/tests/lib/TestCase.php
index 64036084dc..345b2a68e6 100644
--- a/tests/lib/TestCase.php
+++ b/tests/lib/TestCase.php
@@ -385,7 +385,7 @@ abstract class TestCase extends \PHPUnit_Framework_TestCase {
 			$userObject->updateLastLoginTimestamp();
 		}
 		\OC_Util::setupFS($user);
-		if (\OC_User::userExists($user)) {
+		if (\OC::$server->getUserManager()->userExists($user)) {
 			\OC::$server->getUserFolder($user);
 		}
 	}
diff --git a/tests/lib/Traits/EncryptionTrait.php b/tests/lib/Traits/EncryptionTrait.php
index 8a06d37fa7..ba759a51a2 100644
--- a/tests/lib/Traits/EncryptionTrait.php
+++ b/tests/lib/Traits/EncryptionTrait.php
@@ -50,7 +50,7 @@ trait EncryptionTrait {
 		\OC_User::setUserId($user);
 		$this->postLogin();
 		\OC_Util::setupFS($user);
-		if (\OC_User::userExists($user)) {
+		if (\OC::$server->getUserManager()->userExists($user)) {
 			\OC::$server->getUserFolder($user);
 		}
 	}
diff --git a/tests/lib/UserTest.php b/tests/lib/UserTest.php
deleted file mode 100644
index 2a477522de..0000000000
--- a/tests/lib/UserTest.php
+++ /dev/null
@@ -1,55 +0,0 @@
-<?php
-
-/**
- * Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
- * This file is licensed under the Affero General Public License version 3 or
- * later.
- * See the COPYING-README file.
- */
-
-namespace Test;
-
-/**
- * Class User
- *
- * @group DB
- *
- * @package Test
- */
-class UserTest extends TestCase {
-	/**
-	 * @var \OC\User\Backend | \PHPUnit_Framework_MockObject_MockObject $backend
-	 */
-	private $backend;
-	
-	protected function setUp(){
-		parent::setUp();
-
-		$this->backend = $this->createMock(\Test\Util\User\Dummy::class);
-		$manager = \OC::$server->getUserManager();
-		$manager->registerBackend($this->backend);
-	}
-	
-	public function testCheckPassword() {
-
-		$this->backend->expects($this->once())
-			->method('checkPassword')
-			->with($this->equalTo('foo'), $this->equalTo('bar'))
-			->will($this->returnValue('foo'))
-		;
-
-		$this->backend->expects($this->any())
-			->method('implementsActions')
-			->will($this->returnCallback(function ($actions) {
-				if ($actions === \OC\USER\BACKEND::CHECK_PASSWORD) {
-					return true;
-				} else {
-					return false;
-				}
-			}));
-
-		$uid = \OC_User::checkPassword('foo', 'bar');
-		$this->assertEquals($uid, 'foo');
-	}
-
-}