--- WORequest+SOGo copy.m	2020-12-01 18:23:14.000000000 +0100
+++ WORequest+SOGo.m	2020-12-01 18:25:06.000000000 +0100
@@ -127,6 +127,7 @@
 
 //
 // Mac+OS+X/10.10.1 (14B25) CalendarAgent/315
+// macOS/11.0.1 (20B50) CalendarAgent/954
 //
 - (BOOL) isICal
 {
@@ -137,6 +138,7 @@
   return ([self isAppleDAVWithSubstring: @"Mac OS X/10."]
           || [self isAppleDAVWithSubstring: @"Mac_OS_X/"]
           || [self isAppleDAVWithSubstring: @"Mac+OS+X/"]
+          || [self isAppleDAVWithSubstring: @"macOS/"]
           || [self isAppleDAVWithSubstring: @"CoreDAV/"]
           || [[cc userAgent] rangeOfString: @"DAVx5"].location != NSNotFound);
 }
@@ -147,6 +149,7 @@
 // Mac OS X/10.8 (12A269) Calendar/1639
 // Mac OS X/10.8 (12A269) CalendarAgent/47
 // Mac OS X/10.8.1 (12B19) CalendarAgent/47
+// macOS/11.0.1 (20B50) CalendarAgent/954
 //
 - (BOOL) isICal4
 {
@@ -175,6 +178,10 @@
 // Mac OS X/10.8.1 (12B19) AddressBook/1143
 // Mac OS X/10.8.2 (12C60) AddressBook/1167
 //
+// For 11.0, we see:
+//
+// macOS/11.0.1 (20B50) AddressBookCore/2452
+//
 - (BOOL) isMacOSXAddressBookApp
 {
   WEClientCapabilities *cc;
@@ -197,6 +204,11 @@
           [[cc userAgent] rangeOfString: @"Mac OS X"].location != NSNotFound
           && [[cc userAgent] rangeOfString: @"AddressBook"].location != NSNotFound
         )
+        ||
+        (
+          [[cc userAgent] rangeOfString: @"macOS"].location != NSNotFound
+          && [[cc userAgent] rangeOfString: @"AddressBook"].location != NSNotFound
+        )
       );
 
   return b;