diff --git a/resources/sql/autopatches/20141218.maniphestcctxn.php b/resources/sql/autopatches/20141218.maniphestcctxn.php
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20141218.maniphestcctxn.php
@@ -0,0 +1,20 @@
+<?php
+
+$table = new ManiphestTransaction();
+$conn_w = $table->establishConnection('w');
+
+echo "Converting Maniphest CC transactions to modern SUBSCRIBER ".
+  "transactions...\n";
+foreach (new LiskMigrationIterator($table) as $txn) {
+  // ManiphestTransaction::TYPE_CCS
+  if ($txn->getTransactionType() == 'ccs') {
+    queryfx(
+      $conn_w,
+      'UPDATE %T SET transactionType = %s WHERE id = %d',
+      $table->getTableName(),
+      PhabricatorTransactions::TYPE_SUBSCRIBERS,
+      $txn->getID());
+  }
+}
+
+echo "Done.\n";
diff --git a/src/applications/maniphest/storage/ManiphestTransaction.php b/src/applications/maniphest/storage/ManiphestTransaction.php
--- a/src/applications/maniphest/storage/ManiphestTransaction.php
+++ b/src/applications/maniphest/storage/ManiphestTransaction.php
@@ -7,26 +7,23 @@
   const TYPE_STATUS = 'status';
   const TYPE_DESCRIPTION = 'description';
   const TYPE_OWNER  = 'reassign';
-  const TYPE_PROJECTS = 'projects';
   const TYPE_PRIORITY = 'priority';
   const TYPE_EDGE = 'edge';
   const TYPE_SUBPRIORITY = 'subpriority';
   const TYPE_PROJECT_COLUMN = 'projectcolumn';
   const TYPE_MERGED_INTO = 'mergedinto';
   const TYPE_MERGED_FROM = 'mergedfrom';
-
   const TYPE_UNBLOCK = 'unblock';
 
   // NOTE: this type is deprecated. Keep it around for legacy installs
   // so any transactions render correctly.
   const TYPE_ATTACH = 'attach';
   /**
-   * TYPE_CCS is legacy and depracted in favor of
-   * PhabricatorTransactions::TYPE_SUBSCRIBERS; keep it around for legacy
+   * TYPE_PROJECTS is legacy and depracted in favor of
+   * PhabricatorTransactions::TYPE_EDGE; keep it around for legacy
    * transaction-rendering.
    */
-  const TYPE_CCS = 'ccs';
-
+  const TYPE_PROJECTS = 'projects';
 
   const MAILTAG_STATUS = 'maniphest-status';
   const MAILTAG_OWNER = 'maniphest-owner';
@@ -90,7 +87,6 @@
           $phids[] = $old;
         }
         break;
-      case self::TYPE_CCS:
       case self::TYPE_PROJECTS:
         $phids = array_mergev(
           array(
@@ -271,9 +267,6 @@
           return pht('Reassigned');
         }
 
-      case self::TYPE_CCS:
-        return pht('Changed CC');
-
       case self::TYPE_PROJECTS:
         return pht('Changed Projects');
 
@@ -325,9 +318,6 @@
       case self::TYPE_OWNER:
         return 'fa-user';
 
-      case self::TYPE_CCS:
-        return 'fa-envelope';
-
       case self::TYPE_TITLE:
         if ($old === null) {
           return 'fa-pencil';
@@ -546,13 +536,6 @@
             $new_name);
         }
 
-      case self::TYPE_CCS:
-        // TODO: Remove this when we switch to subscribers. Just reuse the
-        // code in the parent.
-        $clone = clone $this;
-        $clone->setTransactionType(PhabricatorTransactions::TYPE_SUBSCRIBERS);
-        return $clone->getTitle();
-
       case self::TYPE_EDGE:
         // TODO: Remove this when we switch to real edges. Just reuse the
         // code in the parent;
@@ -801,13 +784,6 @@
             $new_name);
         }
 
-      case self::TYPE_CCS:
-        // TODO: Remove this when we switch to subscribers. Just reuse the
-        // code in the parent.
-        $clone = clone $this;
-        $clone->setTransactionType(PhabricatorTransactions::TYPE_SUBSCRIBERS);
-        return $clone->getTitleForFeed($story);
-
       case self::TYPE_EDGE:
         // TODO: Remove this when we switch to real edges. Just reuse the
         // code in the parent;
@@ -902,7 +878,6 @@
       case self::TYPE_OWNER:
         $tags[] = self::MAILTAG_OWNER;
         break;
-      case self::TYPE_CCS:
       case PhabricatorTransactions::TYPE_SUBSCRIBERS:
         $tags[] = self::MAILTAG_CC;
         break;