diff --git a/app/src/main/java/eu/faircode/email/AdapterMessage.java b/app/src/main/java/eu/faircode/email/AdapterMessage.java
index 442f4b9457..b23a414603 100644
--- a/app/src/main/java/eu/faircode/email/AdapterMessage.java
+++ b/app/src/main/java/eu/faircode/email/AdapterMessage.java
@@ -188,7 +188,6 @@ import javax.mail.Session;
 import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeMessage;
 
-import biweekly.Biweekly;
 import biweekly.ICalVersion;
 import biweekly.ICalendar;
 import biweekly.component.VEvent;
@@ -350,8 +349,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
     private static final int MAX_RECIPIENTS_COMPACT = 3;
     private static final int MAX_RECIPIENTS_NORMAL = 7;
 
-    private static final String X_ONLINE_MEETING = "X-MICROSOFT-ONLINEMEETINGEXTERNALLINK";
-
     public class ViewHolder extends RecyclerView.ViewHolder implements
             View.OnClickListener,
             View.OnLongClickListener,
@@ -3765,11 +3762,9 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
                     Organizer organizer = event.getOrganizer();
 
-                    RawProperty prop = event.getExperimentalProperty(X_ONLINE_MEETING);
-                    String uri = (prop == null ? null : prop.getValue());
-
+                    Uri uri = CalendarHelper.getOnlineMeetingUrl(context, event);
                     ibCalendar.setVisibility(View.VISIBLE);
-                    ibOnline.setVisibility(TextUtils.isEmpty(uri) ? View.GONE : View.VISIBLE);
+                    ibOnline.setVisibility(uri == null ? View.GONE : View.VISIBLE);
 
                     tvCalendarSummary.setText(summary);
                     tvCalendarSummary.setVisibility(TextUtils.isEmpty(summary) ? View.GONE : View.VISIBLE);
@@ -3966,11 +3961,8 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                                 return intent;
                             }
 
-                            if (action == R.id.ibOnline) {
-                                RawProperty prop = event.getExperimentalProperty(X_ONLINE_MEETING);
-                                String uri = (prop == null ? null : prop.getValue());
-                                return (uri == null ? null : Uri.parse(uri));
-                            }
+                            if (action == R.id.ibOnline)
+                                return CalendarHelper.getOnlineMeetingUrl(context, event);
 
                             Created created = event.getCreated();
                             LastModified modified = event.getLastModified();
diff --git a/app/src/main/java/eu/faircode/email/CalendarHelper.java b/app/src/main/java/eu/faircode/email/CalendarHelper.java
index 23ff965f62..38098ca752 100644
--- a/app/src/main/java/eu/faircode/email/CalendarHelper.java
+++ b/app/src/main/java/eu/faircode/email/CalendarHelper.java
@@ -55,6 +55,7 @@ import biweekly.parameter.ParticipationStatus;
 import biweekly.property.Action;
 import biweekly.property.Attendee;
 import biweekly.property.ICalProperty;
+import biweekly.property.RawProperty;
 import biweekly.property.RecurrenceRule;
 import biweekly.property.Trigger;
 import biweekly.util.Duration;
@@ -106,6 +107,26 @@ public class CalendarHelper {
         return tzid;
     }
 
+    static Uri getOnlineMeetingUrl(Context context, VEvent event) {
+        try {
+            RawProperty prop = event.getExperimentalProperty("X-GOOGLE-CONFERENCE");
+            if (prop == null)
+                prop = event.getExperimentalProperty("X-MICROSOFT-ONLINEMEETINGEXTERNALLINK");
+            if (prop == null)
+                prop = event.getExperimentalProperty("X-MICROSOFT-SKYPETEAMSMEETINGURL");
+            if (prop == null)
+                return null;
+            String url = prop.getValue();
+            if (TextUtils.isEmpty(url))
+                return null;
+            Uri uri = Uri.parse(url);
+            return (uri.isHierarchical() ? uri : null);
+        } catch (Throwable ex) {
+            Log.e(ex);
+            return null;
+        }
+    }
+
     static Long exists(Context context, String selectedAccount, String selectedName, String uid) {
         ContentResolver resolver = context.getContentResolver();
         try (Cursor cursor = resolver.query(CalendarContract.Events.CONTENT_URI,