diff --git a/lib/Kolab/FreeBusy/SourceIMAP.php b/lib/Kolab/FreeBusy/SourceIMAP.php
--- a/lib/Kolab/FreeBusy/SourceIMAP.php
+++ b/lib/Kolab/FreeBusy/SourceIMAP.php
@@ -146,35 +146,11 @@
 					}
 
 					// only consider shared namespace events if user is a confirmed participant (or organizer)
-					if (!$read_all && $folder->get_namespace() == 'shared') {
-						$participant = false;
-						if (is_array($event['organizer']) && !empty($event['organizer']['email'])) {
-							$participant = in_array($event['organizer']['email'], $user_email);
-						}
-						else if (is_array($event['attendees'])) {
-							foreach ($event['attendees'] as $attendee) {
-								if (in_array($attendee['email'], $user_email)) {
-									if ($attendee['status'] == 'ACCEPTED') {
-										$participant = true;
-										break;
-									}
-									else if ($attendee['status'] == 'TENTATIVE') {
-										$event['free_busy'] = 'tentative';
-										$participant = true;
-										break;
-									}
-								}
-							}
-						}
-
-						if (!$participant) {
-							$log->debug('Skip shared event', array($event['uid'], $event['title']));
-							continue;
-						}
-					}
 					// skip declined events
-					else if (is_array($event['attendees']) && !$this->check_participation($event, $user_email)) {
-						$log->debug('Skip declined event', array($event['uid'], $event['title']));
+					if (!$this->check_participation($event, $user_email, $status)
+						|| ($status != 'ACCEPTED' && $status != 'TENTATIVE')
+					) {
+						$log->debug('Skip shared/declined event', array($event['uid'], $event['title']));
 						continue;
 					}
 
@@ -200,7 +176,7 @@
 					}
 
 					// copied from libvcalendar::_to_ical()
-					$ve = $this->to_vevent($event, $calendar);
+					$ve = $this->to_vevent($event, $calendar, $user_email);
 
 					if ($event['recurrence']) {
 						if ($exdates = $event['recurrence']['EXDATE'])
@@ -219,8 +195,8 @@
 									$exdates[] = $exception['recurrence_date'];
 								}
 								// add exception to vcalendar container
-								if (!$exception['cancelled'] && $this->check_participation($exception, $user_email)) {
-									$vex = $this->to_vevent($exception, $calendar);
+								if (!$exception['cancelled'] && $this->check_participation($exception, $user_email, $status) && $status != 'DECLINED') {
+									$vex = $this->to_vevent($exception, $calendar, $user_email);
 									$vex->UID = $event['uid'] . '-' . $i;
 									$calendar->add($vex);
 									$log->debug("Adding event exception for processing:\n" . $vex->serialize());
@@ -335,7 +311,7 @@
 	/**
 	 * Helper method to build a Sabre/VObject from the gieven event data
 	 */
-	private function to_vevent($event, $cal)
+	private function to_vevent($event, $cal, $user_email)
 	{
 		// copied from libvcalendar::_to_ical()
 		$ve = $cal->create('VEVENT');
@@ -349,10 +325,9 @@
 		if (!empty($event['free_busy']))
 			$ve->add('TRANSP', $event['free_busy'] == 'free' ? 'TRANSPARENT' : 'OPAQUE');
 
-		if ($event['free_busy'] == 'tentative')
-			$ve->add('STATUS', 'TENTATIVE');
-		else if (!empty($event['status']))
-			$ve->add('STATUS', $event['status']);
+		if ($this->check_participation($event, $user_email, $status) && $status) {
+			$ve->add('STATUS', $status);
+		}
 
 		return $ve;
 	}
@@ -360,19 +335,31 @@
 	/**
 	 * Helper method to check the participation status of the requested user
 	 */
-	private function check_participation($event, $user_email)
+	private function check_participation($event, $user_email, &$status = null)
 	{
-		$result = true;
+		if (is_array($event['organizer']) && !empty($event['organizer']['email'])) {
+			if (in_array($event['organizer']['email'], $user_email)) {
+				$status = 'ACCEPTED';
+				if ($event['free_busy'] == 'tentative') {
+					$status = 'TENTATIVE';
+				}
+				else if (!empty($event['status'])) {
+					$status = $event['status'];
+				}
+
+				return true;
+			}
+		}
 
 		if (is_array($event['attendees'])) {
 			foreach ($event['attendees'] as $attendee) {
-				if (in_array($attendee['email'], $user_email) && $attendee['status'] == 'DECLINED') {
-					$result = false;
-					break;
+				if (in_array($attendee['email'], $user_email)) {
+					$status = $attendee['status'];
+					return true;
 				}
 			}
 		}
 
-		return $result;
+		return false;
 	}
 }