diff --git a/widget/src/windows/nsDataObj.cpp b/widget/src/windows/nsDataObj.cpp
index 11f2cc637ea..9261cbe71d5 100644
--- a/widget/src/windows/nsDataObj.cpp
+++ b/widget/src/windows/nsDataObj.cpp
@@ -756,15 +756,11 @@ STDMETHODIMP nsDataObj::EndOperation(HRESULT hResult,
                                      DWORD dwEffects)
 {
   mIsInOperation = FALSE;
-  Release();
   return S_OK;
 }
 
 STDMETHODIMP nsDataObj::GetAsyncMode(BOOL *pfIsOpAsync)
 {
-  if (!pfIsOpAsync)
-    return E_FAIL;
-
   *pfIsOpAsync = mIsAsyncMode;
 
   return S_OK;
@@ -772,9 +768,6 @@ STDMETHODIMP nsDataObj::GetAsyncMode(BOOL *pfIsOpAsync)
 
 STDMETHODIMP nsDataObj::InOperation(BOOL *pfInAsyncOp)
 {
-  if (!pfInAsyncOp)
-    return E_FAIL;
-
   *pfInAsyncOp = mIsInOperation;
 
   return S_OK;
diff --git a/widget/src/windows/nsDataObjCollection.cpp b/widget/src/windows/nsDataObjCollection.cpp
index c9819926391..3b11cd1319a 100644
--- a/widget/src/windows/nsDataObjCollection.cpp
+++ b/widget/src/windows/nsDataObjCollection.cpp
@@ -257,48 +257,6 @@ void nsDataObjCollection::AddDataObject(IDataObject * aDataObj)
   mDataObjects.AppendElement(dataObj);
 }
 
-// IAsyncOperation methods
-STDMETHODIMP nsDataObjCollection::EndOperation(HRESULT hResult,
-                                               IBindCtx *pbcReserved,
-                                               DWORD dwEffects)
-{
-  mIsInOperation = FALSE;
-  Release();
-  return S_OK;
-}
-
-STDMETHODIMP nsDataObjCollection::GetAsyncMode(BOOL *pfIsOpAsync)
-{
-  if (!pfIsOpAsync)
-    return E_FAIL;
-
-  *pfIsOpAsync = mIsAsyncMode;
-
-  return S_OK;
-}
-
-STDMETHODIMP nsDataObjCollection::InOperation(BOOL *pfInAsyncOp)
-{
-  if (!pfInAsyncOp)
-    return E_FAIL;
-
-  *pfInAsyncOp = mIsInOperation;
-
-  return S_OK;
-}
-
-STDMETHODIMP nsDataObjCollection::SetAsyncMode(BOOL fDoOpAsync)
-{
-  mIsAsyncMode = fDoOpAsync;
-  return S_OK;
-}
-
-STDMETHODIMP nsDataObjCollection::StartOperation(IBindCtx *pbcReserved)
-{
-  mIsInOperation = TRUE;
-  return S_OK;
-}
-
 // Methods for getting data
 HRESULT nsDataObjCollection::GetFile(LPFORMATETC pFE, LPSTGMEDIUM pSTM)
 {
diff --git a/widget/src/windows/nsDataObjCollection.h b/widget/src/windows/nsDataObjCollection.h
index db0aa3a6d96..c85e3afac3f 100644
--- a/widget/src/windows/nsDataObjCollection.h
+++ b/widget/src/windows/nsDataObjCollection.h
@@ -154,14 +154,6 @@ class nsDataObjCollection : public nsIDataObjCollection, public nsDataObj
 
     // Return the adapter
     //CfDragDrop& GetDragDrop() const;
-        
-    // IAsyncOperation methods
-    STDMETHOD(EndOperation)(HRESULT hResult, IBindCtx *pbcReserved,
-                            DWORD dwEffects);
-    STDMETHOD(GetAsyncMode)(BOOL *pfIsOpAsync);
-    STDMETHOD(InOperation)(BOOL *pfInAsyncOp);
-    STDMETHOD(SetAsyncMode)(BOOL fDoOpAsync);
-    STDMETHOD(StartOperation)(IBindCtx *pbcReserved);
 
   protected:
     BOOL FormatsMatch(const FORMATETC& source, const FORMATETC& target) const;
diff --git a/widget/src/windows/nsDragService.cpp b/widget/src/windows/nsDragService.cpp
index 071082fcb55..39bc27434b0 100644
--- a/widget/src/windows/nsDragService.cpp
+++ b/widget/src/windows/nsDragService.cpp
@@ -303,34 +303,18 @@ nsDragService::StartInvokingDragSession(IDataObject * aDataObj,
   // Start dragging
   StartDragSession();
 
-  // check shell32.dll version and do async drag if it is >= 5.0
-  PRUint64 lShellVersion = GetShellVersion();
-  IAsyncOperation *pAsyncOp = NULL;
-  PRBool isAsyncAvailable = LL_UCMP(lShellVersion, >=, LL_INIT(5, 0));
-  if (isAsyncAvailable)
-  {
-    // do async drag
-    if (SUCCEEDED(aDataObj->QueryInterface(IID_IAsyncOperation,
-                                          (void**)&pAsyncOp)))
-      pAsyncOp->SetAsyncMode(VARIANT_TRUE);
+  nsRefPtr<IAsyncOperation> pAsyncOp;
+  // Offer to do an async drag
+  if (SUCCEEDED(aDataObj->QueryInterface(IID_IAsyncOperation,
+                                         getter_AddRefs(pAsyncOp)))) {
+    pAsyncOp->SetAsyncMode(VARIANT_TRUE);
+  } else {
+    NS_NOTREACHED("When did our data object stop being async");
   }
 
   // Call the native D&D method
   HRESULT res = ::DoDragDrop(aDataObj, mNativeDragSrc, effects, &winDropRes);
 
-  if (isAsyncAvailable)
-  {
-    // if dragging async
-    // check for async operation
-    BOOL isAsync = FALSE;
-    if (pAsyncOp)
-    {
-      pAsyncOp->InOperation(&isAsync);
-      if (!isAsync)
-        aDataObj->Release();
-    }
-  }
-
   // In  cases where the drop operation completed outside the application, update
   // the source node's nsIDOMNSDataTransfer dropEffect value so it is up to date.  
   if (!mSentLocalDropEvent) {