diff --git a/EXPOSITION b/EXPOSITION
index 97985c9d2..c95899ef4 100644
--- a/EXPOSITION
+++ b/EXPOSITION
@@ -77,7 +77,6 @@ Files
     completed.data
     undo.data
     backlog.data
-    synch.key
 
   The pending.data file aspires to contain only pending, waiting and recurring
   tasks, but this is only correct after a GC, and before any tasks are modified.
@@ -94,9 +93,6 @@ Files
   been transmitted to the task server.  It grows unbounded between 'synch'
   commands.
 
-  The synch.key file contains a synch receipt that is used to optimize synch
-  operations.
-
 
 Filter
   A filter is simply a set of command line arguments, but is only a subset of
diff --git a/src/Context.cpp b/src/Context.cpp
index 4ef958691..19d321d79 100644
--- a/src/Context.cpp
+++ b/src/Context.cpp
@@ -525,13 +525,8 @@ void Context::shadow ()
     if (shadow_file._data == location + "/undo.data")
       throw std::string (STRING_CONTEXT_SHADOW_U);
 
-/*
     if (shadow_file._data == location + "/backlog.data")
       throw std::string (STRING_CONTEXT_SHADOW_B);
-*/
-
-    if (shadow_file._data == location + "/synch.key")
-      throw std::string (STRING_CONTEXT_SHADOW_S);
 
     // Compose the command.  Put the rc overrides up front, so that they may
     // be overridden by rc.shadow.command.
diff --git a/src/TDB2.cpp b/src/TDB2.cpp
index a54163e1e..ad1d1c0e7 100644
--- a/src/TDB2.cpp
+++ b/src/TDB2.cpp
@@ -189,7 +189,6 @@ void TF2::add_line (const std::string& line)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// This is so that synch.key can just overwrite and not grow.
 void TF2::clear_lines ()
 {
   _lines.clear ();
diff --git a/src/commands/CmdStatistics.cpp b/src/commands/CmdStatistics.cpp
index 6a511bf09..0578f5c3a 100644
--- a/src/commands/CmdStatistics.cpp
+++ b/src/commands/CmdStatistics.cpp
@@ -63,12 +63,7 @@ int CmdStatistics::execute (std::string& output)
   size_t dataSize = context.tdb2.pending._file.size ()
                   + context.tdb2.completed._file.size ()
                   + context.tdb2.undo._file.size ()
-/*
-                  // TODO Re-enable this once 2.1 has taskd support.
-                  + context.tdb2.backlog._file.size ()
-                  + context.tdb2.synch_key._file.size ()
-*/
-                  ;
+                  + context.tdb2.backlog._file.size ();
 
   // Count the undo transactions.
   std::vector <std::string> undoTxns = context.tdb2.undo.get_lines ();
@@ -277,10 +272,7 @@ int CmdStatistics::execute (std::string& output)
   //      sense to include this.
   row = view.addRow ();
   view.set (row, 0, STRING_CMD_STATS_LAST_SYNC);
-  if (context.tdb2.synch_key._file.exists ())
-    view.set (row, 1, Date (context.tdb2.synch_key._file.mtime ()).toISO ());
-  else
-    view.set (row, 1, "-");
+  view.set (row, 1, "-");
 */
 
   // If an alternating row color is specified, notify the table.
diff --git a/src/en-US.h b/src/en-US.h
index f474ced3a..3ed1d73d7 100644
--- a/src/en-US.h
+++ b/src/en-US.h
@@ -543,7 +543,6 @@
 #define STRING_CONTEXT_SHADOW_C      "Configuration variable 'shadow.file' is set to " "overwrite your completed tasks.  Please change it."
 #define STRING_CONTEXT_SHADOW_U      "Configuration variable 'shadow.file' is set to " "overwrite your undo log.  Please change it."
 #define STRING_CONTEXT_SHADOW_B      "Configuration variable 'shadow.file' is set to " "overwrite your backlog file.  Please change it."
-#define STRING_CONTEXT_SHADOW_S      "Configuration variable 'shadow.file' is set to " "overwrite your synch.key file.  Please change it."
 #define STRING_CONTEXT_SHADOW_UPDATE "[Shadow file '{1}' updated.]"
 
 // Date