diff --git a/Classes/PHPExcel/CachedObjectStorage/Igbinary.php b/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
new file mode 100644
index 00000000..1c6ba312
--- /dev/null
+++ b/Classes/PHPExcel/CachedObjectStorage/Igbinary.php
@@ -0,0 +1,111 @@
+<?php
+/**
+ * PHPExcel
+ *
+ * Copyright (c) 2006 - 2011 PHPExcel
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
+ * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
+ * @version    ##VERSION##, ##DATE##
+ */
+
+
+/**
+ * PHPExcel_CachedObjectStorage_Igbinary
+ *
+ * @category   PHPExcel
+ * @package    PHPExcel_CachedObjectStorage
+ * @copyright  Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
+ */
+class PHPExcel_CachedObjectStorage_Igbinary extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
+
+	private function _storeData() {
+		if ($this->_currentCellIsDirty) {
+			$this->_currentObject->detach();
+
+			$this->_cellCache[$this->_currentObjectID] = igbinary_serialize($this->_currentObject);
+			$this->_currentCellIsDirty = false;
+		}
+		$this->_currentObjectID = $this->_currentObject = null;
+	}	//	function _storeData()
+
+
+    /**
+     *	Add or Update a cell in cache identified by coordinate address
+     *
+     *	@param	string			$pCoord		Coordinate address of the cell to update
+     *	@param	PHPExcel_Cell	$cell		Cell to update
+	 *	@return	void
+     *	@throws	Exception
+     */
+	public function addCacheData($pCoord, PHPExcel_Cell $cell) {
+		if (($pCoord !== $this->_currentObjectID) && ($this->_currentObjectID !== null)) {
+			$this->_storeData();
+		}
+
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = $cell;
+		$this->_currentCellIsDirty = true;
+
+		return $cell;
+	}	//	function addCacheData()
+
+
+    /**
+     * Get cell at a specific coordinate
+     *
+     * @param 	string 			$pCoord		Coordinate of the cell
+     * @throws 	Exception
+     * @return 	PHPExcel_Cell 	Cell that was found, or null if not found
+     */
+	public function getCacheData($pCoord) {
+		if ($pCoord === $this->_currentObjectID) {
+			return $this->_currentObject;
+		}
+		$this->_storeData();
+
+		//	Check if the entry that has been requested actually exists
+		if (!isset($this->_cellCache[$pCoord])) {
+			//	Return null if requested entry doesn't exist in cache
+			return null;
+		}
+
+		//	Set current entry to the requested entry
+		$this->_currentObjectID = $pCoord;
+		$this->_currentObject = igbinary_unserialize($this->_cellCache[$pCoord]);
+		//	Re-attach the parent worksheet
+		$this->_currentObject->attach($this->_parent);
+
+		//	Return requested entry
+		return $this->_currentObject;
+	}	//	function getCacheData()
+
+
+	public function unsetWorksheetCells() {
+		if(!is_null($this->_currentObject)) {
+			$this->_currentObject->detach();
+			$this->_currentObject = $this->_currentObjectID = null;
+		}
+		$this->_cellCache = array();
+
+		//	detach ourself from the worksheet, so that it can then delete this object successfully
+		$this->_parent = null;
+	}	//	function unsetWorksheetCells()
+
+}
diff --git a/Classes/PHPExcel/CachedObjectStorageFactory.php b/Classes/PHPExcel/CachedObjectStorageFactory.php
index d6e39b02..b6f53995 100644
--- a/Classes/PHPExcel/CachedObjectStorageFactory.php
+++ b/Classes/PHPExcel/CachedObjectStorageFactory.php
@@ -4,6 +4,7 @@ class PHPExcel_CachedObjectStorageFactory {
 	const cache_in_memory				= 'Memory';
 	const cache_in_memory_gzip			= 'MemoryGZip';
 	const cache_in_memory_serialized	= 'MemorySerialized';
+	const cache_igbinary				= 'Igbinary';
 	const cache_to_discISAM				= 'DiscISAM';
 	const cache_to_apc					= 'APC';
 	const cache_to_memcache				= 'Memcache';
@@ -22,6 +23,7 @@ class PHPExcel_CachedObjectStorageFactory {
 		self::cache_in_memory,
 		self::cache_in_memory_gzip,
 		self::cache_in_memory_serialized,
+		self::cache_igbinary,
 		self::cache_to_phpTemp,
 		self::cache_to_discISAM,
 		self::cache_to_apc,
@@ -39,6 +41,8 @@ class PHPExcel_CachedObjectStorageFactory {
 													),
 		self::cache_in_memory_serialized	=> array(
 													),
+		self::cache_igbinary				=> array(
+													),
 		self::cache_to_phpTemp				=> array( 'memoryCacheSize'	=> '1MB'
 													),
 		self::cache_to_discISAM				=> array( 'dir'				=> NULL
@@ -116,6 +120,11 @@ class PHPExcel_CachedObjectStorageFactory {
 					return false;
 				}
 				break;
+			case self::cache_igbinary :
+				if (!function_exists('igbinary_serialize')) {
+					return false;
+				}
+				break;
 		}
 
 		self::$_storageMethodParameters[$method] = self::$_storageMethodDefaultParameters[$method];