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diff --git a/src/operator-unsubscribe.cc b/src/operator-unsubscribe.cc
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+++ b/src/operator-unsubscribe.cc
@@ -0,0 +1,91 @@
+/**  --------------------------------------------------------------------
+ *  @file  operator-unsubscribe.cc
+ *  @brief Implementation of the UNSUBSCRIBE command.
+ *  @author Andreas Aardal Hanssen
+ *  @date 2002-2005
+ *  -----------------------------------------------------------------  **/
+#include <string>
+#include <vector>
+#include <iostream>
+#include "convert.h"
+#include <sys/stat.h>
+
+#include "recursivedescent.h"
+
+#include "session.h"
+#include "depot.h"
+#include "operators.h"
+
+using namespace ::std;
+using namespace Binc;
+
+//----------------------------------------------------------------------
+UnsubscribeOperator::UnsubscribeOperator(void)
+{
+}
+
+//----------------------------------------------------------------------
+UnsubscribeOperator::~UnsubscribeOperator(void)
+{
+}
+
+//----------------------------------------------------------------------
+const string UnsubscribeOperator::getName(void) const
+{
+  return "UNSUBSCRIBE";
+}
+
+//----------------------------------------------------------------------
+int UnsubscribeOperator::getState(void) const
+{
+  return Session::AUTHENTICATED | Session::SELECTED;
+}
+
+//------------------------------------------------------------------------
+Operator::ProcessResult UnsubscribeOperator::process(Depot &depot,
+                                                     Request &command)
+{
+  const string &mailbox = command.getMailbox();
+  const string &canonmailbox = toCanonMailbox(mailbox);
+
+  depot.loadSubscribes();
+  if (!depot.unsubscribeTo(canonmailbox)) {
+    Session &session = Session::getInstance();
+    session.setLastError("Not subscribed to " + toImapString(mailbox));
+    return NO;
+  }
+
+  depot.saveSubscribes();
+
+  return OK;
+}
+
+//----------------------------------------------------------------------
+Operator::ParseResult UnsubscribeOperator::parse(Request &c_in) const
+{
+  Session &session = Session::getInstance();
+
+  if (c_in.getUidMode())
+    return REJECT;
+
+  Operator::ParseResult res;
+  if ((res = expectSPACE()) != ACCEPT) {
+    session.setLastError("Expected SPACE");
+    return res;
+  }
+
+  string mailbox;
+  if ((res = expectMailbox(mailbox)) != ACCEPT) {
+    session.setLastError("Expected mailbox");
+    return res;
+  }
+
+  if ((res = expectCRLF()) != ACCEPT) {
+    session.setLastError("Expected CRLF");
+    return res;
+  }
+
+  c_in.setMailbox(mailbox);
+
+  return ACCEPT;
+}