--- chrome/content/sogo-connector/general/sync.addressbook.groupdav.js	Fr 22. Nov 21:31:04 2013
+++ chrome/content/sogo-connector/general/sync.addressbook.groupdav.js	Mo  9. Dez 16:32:08 2013
@@ -369,8 +369,9 @@
         this.progressMgr.updateAddressBook(this.gURL);
         if (Components.isSuccessCode(status)
             && data
-            && (data.toLowerCase().indexOf("begin:vcard") == 0))
-            this.importCard(key, data);
+            && (data.toLowerCase().indexOf("begin:vcard") >= 0))
+            // strip content (i.e. header lines) before "BEGIN:VCARD",
+            this.importCard(key, data.substring(data.toLowerCase().indexOf("begin:vcard")));
         else
             this.appendFailure(status, key);
 
@@ -385,8 +386,9 @@
         this.progressMgr.updateAddressBook(this.gURL);
         if (Components.isSuccessCode(status)
             && data
-            && (data.toLowerCase().indexOf("begin:vlist") == 0))
-            this.importList(key, data);
+            && (data.toLowerCase().indexOf("begin:vlist") >= 0))
+            // strip content (i.e. header lines) before "BEGIN:VCARD",
+            this.importList(key, data.substring(data.toLowerCase().indexOf("begin:vlist")));
         else
             this.appendFailure(status, key);
         if (this.remainingDownloads == 0) {