diff --git a/src/renderers/dom/client/utils/DOMChildrenOperations.js b/src/renderers/dom/client/utils/DOMChildrenOperations.js
index e71266c559..ce266352d7 100644
--- a/src/renderers/dom/client/utils/DOMChildrenOperations.js
+++ b/src/renderers/dom/client/utils/DOMChildrenOperations.js
@@ -9,8 +9,6 @@
  * @providesModule DOMChildrenOperations
  */
 
-/* globals MSApp */
-
 'use strict';
 
 var DOMLazyTree = require('DOMLazyTree');
@@ -18,6 +16,7 @@ var Danger = require('Danger');
 var ReactMultiChildUpdateTypes = require('ReactMultiChildUpdateTypes');
 var ReactPerf = require('ReactPerf');
 
+var createMicrosoftUnsafeLocalFunction = require('createMicrosoftUnsafeLocalFunction');
 var setInnerHTML = require('setInnerHTML');
 var setTextContent = require('setTextContent');
 
@@ -33,19 +32,14 @@ function getNodeAfter(parentNode, node) {
  * @param {number} index Index at which to insert the child.
  * @internal
  */
-function insertChildAt(parentNode, childNode, referenceNode) {
-  // We rely exclusively on `insertBefore(node, null)` instead of also using
-  // `appendChild(node)`. (Using `undefined` is not allowed by all browsers so
-  // we are careful to use `null`.)
-
-  if (typeof MSApp !== 'undefined' && MSApp.execUnsafeLocalFunction) {
-    MSApp.execUnsafeLocalFunction(function() {
-      parentNode.insertBefore(childNode, referenceNode);
-    });
-  } else {
+var insertChildAt = createMicrosoftUnsafeLocalFunction(
+  function(parentNode, childNode, referenceNode) {
+    // We rely exclusively on `insertBefore(node, null)` instead of also using
+    // `appendChild(node)`. (Using `undefined` is not allowed by all browsers so
+    // we are careful to use `null`.)
     parentNode.insertBefore(childNode, referenceNode);
   }
-}
+);
 
 function insertLazyTreeChildAt(parentNode, childTree, referenceNode) {
   DOMLazyTree.insertTreeBefore(parentNode, childTree, referenceNode);
diff --git a/src/renderers/dom/client/utils/DOMLazyTree.js b/src/renderers/dom/client/utils/DOMLazyTree.js
index 38b63b4415..28ae4b98ed 100644
--- a/src/renderers/dom/client/utils/DOMLazyTree.js
+++ b/src/renderers/dom/client/utils/DOMLazyTree.js
@@ -9,10 +9,9 @@
  * @providesModule DOMLazyTree
  */
 
-/* globals MSApp */
-
 'use strict';
 
+var createMicrosoftUnsafeLocalFunction = require('createMicrosoftUnsafeLocalFunction');
 var setTextContent = require('setTextContent');
 
 /**
@@ -52,17 +51,12 @@ function insertTreeChildren(tree) {
   }
 }
 
-function insertTreeBefore(parentNode, tree, referenceNode) {
-  if (typeof MSApp !== 'undefined' && MSApp.execUnsafeLocalFunction) {
-    MSApp.execUnsafeLocalFunction(function() {
-      parentNode.insertBefore(tree.node, referenceNode);
-    });
-  } else {
+var insertTreeBefore = createMicrosoftUnsafeLocalFunction(
+  function(parentNode, tree, referenceNode) {
     parentNode.insertBefore(tree.node, referenceNode);
+    insertTreeChildren(tree);
   }
-
-  insertTreeChildren(tree);
-}
+);
 
 function replaceChildWithTree(oldNode, newTree) {
   oldNode.parentNode.replaceChild(newTree.node, oldNode);
diff --git a/src/renderers/dom/client/utils/createMicrosoftUnsafeLocalFunction.js b/src/renderers/dom/client/utils/createMicrosoftUnsafeLocalFunction.js
new file mode 100644
index 0000000000..834ad9849b
--- /dev/null
+++ b/src/renderers/dom/client/utils/createMicrosoftUnsafeLocalFunction.js
@@ -0,0 +1,31 @@
+/**
+ * Copyright 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule createMicrosoftUnsafeLocalFunction
+ */
+
+/* globals MSApp */
+
+'use strict';
+
+/**
+ * Create a function which has 'unsafe' privileges (required by windows8 apps)
+ */
+var createMicrosoftUnsafeLocalFunction = function(func) {
+  if (typeof MSApp !== 'undefined' && MSApp.execUnsafeLocalFunction) {
+    return function(arg0, arg1, arg2, arg3) {
+      MSApp.execUnsafeLocalFunction(function() {
+        return func(arg0, arg1, arg2, arg3);
+      });
+    };
+  } else {
+    return func;
+  }
+};
+
+module.exports = createMicrosoftUnsafeLocalFunction;
diff --git a/src/renderers/dom/client/utils/setInnerHTML.js b/src/renderers/dom/client/utils/setInnerHTML.js
index 15278d4474..222ddfbdce 100644
--- a/src/renderers/dom/client/utils/setInnerHTML.js
+++ b/src/renderers/dom/client/utils/setInnerHTML.js
@@ -9,8 +9,6 @@
  * @providesModule setInnerHTML
  */
 
-/* globals MSApp */
-
 'use strict';
 
 var ExecutionEnvironment = require('ExecutionEnvironment');
@@ -18,6 +16,8 @@ var ExecutionEnvironment = require('ExecutionEnvironment');
 var WHITESPACE_TEST = /^[ \r\n\t\f]/;
 var NONVISIBLE_TEST = /<(!--|link|noscript|meta|script|style)[ \r\n\t\f\/>]/;
 
+var createMicrosoftUnsafeLocalFunction = require('createMicrosoftUnsafeLocalFunction');
+
 /**
  * Set the innerHTML property of a node, ensuring that whitespace is preserved
  * even in IE8.
@@ -26,18 +26,11 @@ var NONVISIBLE_TEST = /<(!--|link|noscript|meta|script|style)[ \r\n\t\f\/>]/;
  * @param {string} html
  * @internal
  */
-var setInnerHTML = function(node, html) {
-  node.innerHTML = html;
-};
-
-// Win8 apps: Allow all html to be inserted
-if (typeof MSApp !== 'undefined' && MSApp.execUnsafeLocalFunction) {
-  setInnerHTML = function(node, html) {
-    MSApp.execUnsafeLocalFunction(function() {
-      node.innerHTML = html;
-    });
-  };
-}
+var setInnerHTML = createMicrosoftUnsafeLocalFunction(
+  function(node, html) {
+    node.innerHTML = html;
+  }
+);
 
 if (ExecutionEnvironment.canUseDOM) {
   // IE8: When updating a just created node with innerHTML only leading