diff --git a/src/java/davmail/caldav/CaldavConnection.java b/src/java/davmail/caldav/CaldavConnection.java
index 87082665..e2fa6f23 100644
--- a/src/java/davmail/caldav/CaldavConnection.java
+++ b/src/java/davmail/caldav/CaldavConnection.java
@@ -208,7 +208,7 @@ public class CaldavConnection extends AbstractConnection {
         } else if ("PROPFIND".equals(command) && "users".equals(paths[1]) && paths.length == 4 && "outbox".equals(paths[3])) {
             sendOutbox(request, paths[2]);
         } else if ("POST".equals(command) && "users".equals(paths[1]) && paths.length == 4 && "outbox".equals(paths[3])) {
-            sendFreeBusy(paths[2]);
+            sendFreeBusy(body);
         } else if ("PROPFIND".equals(command) && "users".equals(paths[1]) && paths.length == 4 && "calendar".equals(paths[3])) {
             sendCalendar(request, depth, paths[2]);
         } else if ("REPORT".equals(command) && "users".equals(paths[1]) && paths.length == 4 && "calendar".equals(paths[3])