diff --git a/calendar/inc/class.calendar_boupdate.inc.php b/calendar/inc/class.calendar_boupdate.inc.php
index ff31b4dca0..8d21f8d0d5 100644
--- a/calendar/inc/class.calendar_boupdate.inc.php
+++ b/calendar/inc/class.calendar_boupdate.inc.php
@@ -3338,10 +3338,21 @@ class calendar_boupdate extends calendar_bo
 				$preferences = new Api\Preferences($event['owner']);
 			}
 			$part_prefs = $preferences->read_repository();
-			switch($part_prefs['calendar']['reset_stati'])
+			$reset_pref = !str_starts_with($uid, 'r') ? 'reset_stati' : 'reset_resource_status';
+			switch($part_prefs['calendar'][$reset_pref])
 			{
 				case 'no':
 					break;
+				case 'unavailable':
+					// Check new time, see if resource is available
+					static $resource_bo = new resources_bo();
+					$available = $resource_bo->checkUseable(substr($uid, 1), $event['start'], $event['end']);
+					if(!$available['useable'] || $available['useable'] < $q)
+					{
+						$status_reset = true;
+						$event['participants'][$uid] = calendar_so::combine_status('U', $q, $r);
+					}
+					break;
 				case 'startday':
 					if($sameday)
 					{
diff --git a/calendar/inc/class.calendar_hooks.inc.php b/calendar/inc/class.calendar_hooks.inc.php
index 8595dbfd2a..dfa078ba61 100644
--- a/calendar/inc/class.calendar_hooks.inc.php
+++ b/calendar/inc/class.calendar_hooks.inc.php
@@ -235,6 +235,9 @@ class calendar_hooks
 			'all'		=> lang('Always'),
 			'startday'	=> lang('If start day differs'),
 		);
+		$reset_resource_stati_on_shifts = array_merge($reset_stati_on_shifts, array(
+			'unavailable' => lang("If resource is unavailable"),
+		));
 		$freebusy_values = array(
 			0		=> lang('No'),
 			1		=> lang('Yes'),
@@ -455,6 +458,16 @@ class calendar_hooks
 				'xmlrpc' => True,
 				'admin'  => False,
 			),
+			'reset_resource_status' => array(
+				'type'    => 'select',
+				'label'   => 'Reset resource status on event shifts',
+				'name'    => 'reset_resource_status',
+				'help'    => 'Select whether you want the resource status reset to unknown, if an event is shifted later on.',
+				'values'  => $reset_resource_stati_on_shifts,
+				'default' => 'all',
+				'xmlrpc'  => True,
+				'admin'   => False,
+			),
 			'no_category_custom_color' => array(
 				'type' => 'color',
 				'label' => 'Custom event color',
diff --git a/calendar/tests/ResetParticipantStatusTest.php b/calendar/tests/ResetParticipantStatusTest.php
index 53698e68e5..6fb232ab5c 100644
--- a/calendar/tests/ResetParticipantStatusTest.php
+++ b/calendar/tests/ResetParticipantStatusTest.php
@@ -24,6 +24,9 @@ class ResetParticipantStatusTest extends \EGroupware\Api\AppTest
 	// Method under test with modified access
 	private $check_method = null;
 
+	// Events that need deleting
+	protected $event_ids = [];
+
 	public static function setUpBeforeClass() : void
 	{
 		parent::setUpBeforeClass();
@@ -49,6 +52,12 @@ class ResetParticipantStatusTest extends \EGroupware\Api\AppTest
 
 	protected function tearDown() : void
 	{
+		foreach($this->event_ids as $event_id)
+		{
+			$this->bo->delete($event_id, 0, true);
+			// Once again if keep deleted is on
+			$this->bo->delete($event_id, 0, true);
+		}
 
 		// Clean up user
 		$GLOBALS['egw']->accounts->delete($this->account_id);
@@ -107,7 +116,7 @@ class ResetParticipantStatusTest extends \EGroupware\Api\AppTest
 			'account' => $this->account_id,
 			'pref' => 'user',
 			'app' => 'calendar',
-			'set' => array('reset_stati' => 'startday')
+			'set' => array('reset_stati' => 'startday', 'reset_resource_status', 'startday')
 		);
 		$pref_command = new \admin_cmd_edit_preferences($pref);
 		$pref_command->run();
@@ -124,9 +133,9 @@ class ResetParticipantStatusTest extends \EGroupware\Api\AppTest
 				// Current user, no change
 				$this->assertEquals($participant[$id], $status, "Participant $id was changed");
 			}
-			if(is_int($id))
+			if(is_int($id) || str_starts_with($id, 'c'))
 			{
-				// Users respect preference, in this case no change
+				// Users & resources respect preference, in this case no change
 				$this->assertEquals($participant[$id], $status, "Participant $id was changed");
 			}
 			else
@@ -161,7 +170,7 @@ class ResetParticipantStatusTest extends \EGroupware\Api\AppTest
 			'account' => $this->account_id,
 			'pref' => 'user',
 			'app' => 'calendar',
-			'set' => array('reset_stati' => $change_preference)
+			'set' => array('reset_stati' => $change_preference, 'reset_resource_status' => $change_preference)
 		);
 		$pref_command = new \admin_cmd_edit_preferences($pref);
 		$pref_command->run();
@@ -191,6 +200,51 @@ class ResetParticipantStatusTest extends \EGroupware\Api\AppTest
 		}
 	}
 
+
+	/**
+	 * Test that moving the event to a different day resets or keeps status for
+	 * resources according to if the resource is available for the new time.
+	 * Other preference options are tested by testChangeUsesPreference.
+	 */
+	public function testResourceAvailability()
+	{
+		// Get test event
+		$event = $old_event = $this->get_event();
+		$participant = $event['participants'] = $old_event['participants'] = array(
+			'r1' => 'A1',
+			'r2' => 'A1',
+		);
+
+		// Set a conflict on r2 - need a real event in the DB
+		$conflict = $this->get_event();
+		$conflict['start'] += 24 * 3600;
+		$conflict['end'] += 24 * 3600;
+		$conflict['participants']['r2'] = 'A1';
+
+		$this->event_ids[] = $this->bo->save($conflict);
+
+		// Set preference
+		$pref = array(
+			'account' => $event['owner'],
+			'pref'    => 'user',
+			'app'     => 'calendar',
+			'set'     => array('reset_resource_status' => 'unavailable')
+		);
+		$pref_command = new \admin_cmd_edit_preferences($pref);
+		$pref_command->run();
+
+		// Forward 1 day
+		$event['start'] += 24 * 3600;
+		$event['end'] += 24 * 3600;
+
+		// Check & reset status
+		$reset = $this->check_method->invokeArgs($this->bo, array(&$event, $old_event));
+
+		$this->assertTrue($reset, "Resource status was not reset");
+		$this->assertEquals($event['participants']['r1'], 'A1', "Resource status was changed");
+		$this->assertEquals($event['participants']['r2'], 'U', "Resource status was not changed, should have been reset");
+	}
+
 	protected function get_event()
 	{
 		return array(
@@ -247,6 +301,18 @@ class ResetParticipantStatusTest extends \EGroupware\Api\AppTest
 		);
 	}
 
+	/**
+	 * Different values for the status change on event change preference
+	 *
+	 * @see calendar_hooks::settings()
+	 */
+	public function resouceStatusPreferenceProvider()
+	{
+		return array(
+			array('unavailable') // Change status if resouce is unavailable
+		);
+	}
+
 	public function participantProvider()
 	{
 		return array(