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diff --git a/M4-RCs/qpid/cpp/src/qpid/cluster/WriteEstimate.h b/M4-RCs/qpid/cpp/src/qpid/cluster/WriteEstimate.h
deleted file mode 100644
index 97b1435fcc..0000000000
--- a/M4-RCs/qpid/cpp/src/qpid/cluster/WriteEstimate.h
+++ /dev/null
@@ -1,69 +0,0 @@
-#ifndef QPID_CLUSTER_WRITEESTIMATE_H
-#define QPID_CLUSTER_WRITEESTIMATE_H
-
-/*
- *
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- * 
- *   http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- *
- */
-
-#include "qpid/sys/Mutex.h"
-
-namespace qpid {
-namespace cluster {
-
-/**
- * Estimate the amount of data that a connection can write between sending
- * a doOutput notice and re-receiving it.
- *
- * The goal is to avoid ever write-idling the connection by sending
- * the next doOutput request as soon as we've processed the previous
- * one, such that data generated by the previous request will keep the
- * writer busy till the next one is delivered.
- *
- */
-class WriteEstimate
-{
-  public:
-    WriteEstimate(size_t initial=4096);
-
-    /** About to send a doOutput request.
-     * Update estimation state and return size for next request.
-     */
-    size_t sending(size_t buffered);
-
-    /**
-     * doOutput request just delivered, not yet executed. Update the estimate.
-     * and estimate how much data to request in the next onOutput
-     * request. 0 means don't send an onOutput request.
-     *
-     * @param delivered value in doOutput control.
-     */
-    void delivered(size_t delivered, size_t sent, size_t buffered);
-
-    /** Last estimate delivered, i.e. known to cluster */
-    size_t getLastEstimate() const { return estimate; }
-
-  private:
-    bool growing;
-    size_t estimate, lastEstimate;
-};
-
-}} // namespace qpid::cluster
-
-#endif  /*!QPID_CLUSTER_WRITEESTIMATE_H*/