diff -Nur SOGo-5.9.1/SoObjects/SOGo/WORequest+SOGo.h SOGo-5.9.1.debug/SoObjects/SOGo/WORequest+SOGo.h
--- SOGo-5.9.1/SoObjects/SOGo/WORequest+SOGo.h	2023-12-12 13:18:09.000000000 +0100
+++ SOGo-5.9.1.debug/SoObjects/SOGo/WORequest+SOGo.h	2024-02-08 09:29:20.956000000 +0100
@@ -37,6 +37,7 @@
 - (BOOL) isIPhoneAddressBookApp;
 - (BOOL) isAndroid;
 - (BOOL) isMacOSXCalendar;
+- (BOOL) isThunderbird;
 
 @end