diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Features/BCC/FeatureBCC.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Features/BCC/FeatureBCC.cs
index 27e55ec..9dcdc4f 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Features/BCC/FeatureBCC.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Features/BCC/FeatureBCC.cs
@@ -44,7 +44,7 @@ namespace Acacia.Features.BCC
                         // Check we're in the SentMail folder
                         using (IFolder folder = mail.Parent)
                         {
-                            if (_folderRegistration.IsApplicable(folder))
+                            if (folder != null && _folderRegistration.IsApplicable(folder))
                                 CheckBCC(mail);
                         }
                     };
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Features/SecondaryContacts/FeatureSecondaryContacts.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Features/SecondaryContacts/FeatureSecondaryContacts.cs
index 1d9a666..c21316c 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Features/SecondaryContacts/FeatureSecondaryContacts.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Features/SecondaryContacts/FeatureSecondaryContacts.cs
@@ -57,6 +57,9 @@ namespace Acacia.Features.SecondaryContacts
 
             public override bool IsApplicable(IFolder folder)
             {
+                if (folder == null)
+                    return false;
+
                 // Check the sync type.
                 // Also allow again if the sync type is user contact, it may not have been fully patched.
                 if (FolderUtils.GetFolderSyncType(folder) != OutlookConstants.SyncType.Unknown &&
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/OutlookConstants.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/OutlookConstants.cs
index 4e6cc5e..a6d0908 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/OutlookConstants.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/OutlookConstants.cs
@@ -89,6 +89,9 @@ namespace Acacia
 
         public const string PR_CONTAINER_CLASS = PROP + "3613" + PT_UNICODE;
 
+        public const string PR_ENTRYID = PROP + "0FFF" + PT_BINARY;
+        public const string PR_PARENT_ENTRYID = PROP + "0E09" + PT_BINARY;
+
         #endregion
 
         #region Email specific
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/AppointmentItemWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/AppointmentItemWrapper.cs
index 8a77c90..cfc2283 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/AppointmentItemWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/AppointmentItemWrapper.cs
@@ -105,7 +105,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         override public string EntryID { get { return _item.EntryID; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -114,26 +114,6 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (IBase parent = Mapping.Wrap<IBase>(_item.Parent))
-                {
-                    return parent.EntryID;
-                }
-            }
-        }
-
-        override public IStore GetStore()
-        {
-            using (ComRelease com = new ComRelease())
-            {
-                NSOutlook.Folder parent = com.Add(_item.Parent);
-                return Mapping.Wrap(parent?.Store);
-            }
-        }
-
         override public void Delete() { _item.Delete(); }
 
         #endregion
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/ContactItemWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/ContactItemWrapper.cs
index a22816d..7085aa3 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/ContactItemWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/ContactItemWrapper.cs
@@ -220,7 +220,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         override public string EntryID { get { return _item.EntryID; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -229,27 +229,6 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (ComRelease com = new ComRelease())
-                {
-                    NSOutlook.Folder parent = com.Add(_item.Parent);
-                    return parent?.EntryID;
-                }
-            }
-        }
-
-        override public IStore GetStore()
-        {
-            using (ComRelease com = new ComRelease())
-            {
-                NSOutlook.Folder parent = com.Add(_item.Parent);
-                return Mapping.Wrap(parent?.Store);
-            }
-        }
-
         override public void Delete() { _item.Delete(); }
 
         #endregion
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/DistributionListWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/DistributionListWrapper.cs
index 5cb3f3e..7cd5cb5 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/DistributionListWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/DistributionListWrapper.cs
@@ -236,7 +236,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         override public string EntryID { get { return _item.EntryID; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -245,27 +245,6 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (ComRelease com = new ComRelease())
-                {
-                    NSOutlook.Folder parent = com.Add(_item.Parent);
-                    return parent?.EntryID;
-                }
-            }
-        }
-
-        override public IStore GetStore()
-        {
-            using (ComRelease com = new ComRelease())
-            {
-                NSOutlook.Folder parent = com.Add(_item.Parent);
-                return Mapping.Wrap(parent?.Store);
-            }
-        }
-
         override public void Delete() { _item.Delete(); }
 
         #endregion
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/FolderWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/FolderWrapper.cs
index 2c5587b..0fe7af6 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/FolderWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/FolderWrapper.cs
@@ -79,7 +79,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         public string FullFolderPath { get { return _item.FullFolderPath; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -87,19 +87,7 @@ namespace Acacia.Stubs.OutlookWrappers
                 return Mapping.Wrap<IFolder>(_item.Parent as NSOutlook.Folder);
             }
         }
-
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (ComRelease com = new ComRelease())
-                {
-                    NSOutlook.Folder parent = com.Add(_item.Parent);
-                    return parent?.EntryID;
-                }
-            }
-        }
-
+        
         /// <summary>
         /// Checks if the folder is at the specified depth. The root folder is at depth 0, its children at depth 1, etc.
         /// This function exists because sometimes it's need to determine if a folder is at a specific depth; using this
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/MailItemWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/MailItemWrapper.cs
index aab1323..7589cd5 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/MailItemWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/MailItemWrapper.cs
@@ -164,7 +164,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         override public string EntryID { get { return _item.EntryID; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -173,27 +173,6 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (ComRelease com = new ComRelease())
-                {
-                    NSOutlook.Folder parent = com.Add(_item.Parent);
-                    return parent?.EntryID;
-                }
-            }
-        }
-
-        override public IStore GetStore()
-        {
-            using (ComRelease com = new ComRelease())
-            {
-                NSOutlook.Folder parent = com.Add(_item.Parent);
-                return Mapping.Wrap(parent?.Store);
-            }
-        }
-
         override public void Delete() { _item.Delete(); }
 
         #endregion
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/MeetingItemWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/MeetingItemWrapper.cs
index 3c3adbc..e644fbb 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/MeetingItemWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/MeetingItemWrapper.cs
@@ -101,7 +101,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         override public string EntryID { get { return _item.EntryID; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -110,27 +110,6 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (ComRelease com = new ComRelease())
-                {
-                    NSOutlook.Folder parent = com.Add(_item.Parent);
-                    return parent?.EntryID;
-                }
-            }
-        }
-
-        override public IStore GetStore()
-        {
-            using (ComRelease com = new ComRelease())
-            {
-                NSOutlook.Folder parent = com.Add(_item.Parent);
-                return Mapping.Wrap(parent?.Store);
-            }
-        }
-
         override public void Delete() { _item.Delete(); }
 
         #endregion
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/NoteItemWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/NoteItemWrapper.cs
index 577d0f1..2e128fe 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/NoteItemWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/NoteItemWrapper.cs
@@ -76,7 +76,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         override public string EntryID { get { return _item.EntryID; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -85,27 +85,6 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (ComRelease com = new ComRelease())
-                {
-                    NSOutlook.Folder parent = com.Add(_item.Parent);
-                    return parent?.EntryID;
-                }
-            }
-        }
-
-        override public IStore GetStore()
-        {
-            using (ComRelease com = new ComRelease())
-            {
-                NSOutlook.Folder parent = com.Add(_item.Parent);
-                return Mapping.Wrap(parent?.Store);
-            }
-        }
-
         override public void Delete() { _item.Delete(); }
 
         #endregion
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/OutlookWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/OutlookWrapper.cs
index 4a2b65f..ae5bb3c 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/OutlookWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/OutlookWrapper.cs
@@ -82,9 +82,45 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        public abstract string EntryID { get; }
-        public abstract IFolder Parent { get; }
-        public abstract string ParentEntryID { get; }
+        abstract public string EntryID
+        {
+            get;
+        }
+
+        public IFolder Parent
+        {
+            get
+            {
+                if (!CanAccessParent)
+                    return null;
+
+                return ParentUnchecked;
+            }
+        }
+
+        protected abstract IFolder ParentUnchecked { get; }
+
+        private bool CanAccessParent
+        {
+            get
+            {
+                // [KOE-132]: Somehow when sending mail through other applications, accessing parent
+                // causes an access violation on Outlook 2013. I have been unable to fully determine
+                // the exact cause, but the entry id seems to be null and the parent entry id set in
+                // this case. So just avoid that.
+                if (GetProperty(OutlookConstants.PR_ENTRYID) == null && GetProperty(OutlookConstants.PR_PARENT_ENTRYID) != null)
+                    return false;
+                return true;
+            }
+        }
+
+        public string ParentEntryID
+        {
+            get
+            {
+                return StringUtil.BytesToHex((byte[])GetProperty(OutlookConstants.PR_PARENT_ENTRYID));
+            }
+        }
 
         virtual public string StoreID
         {
@@ -190,10 +226,18 @@ namespace Acacia.Stubs.OutlookWrappers
 
         #endregion
 
+        virtual public IStore GetStore()
+        {
+            using (IFolder parent = Parent)
+            {
+                return parent?.GetStore();
+            }
+        }
+
         public override abstract string ToString();
-        public abstract IStore GetStore();
         public abstract void Delete();
 
+
         override public string DebugContext
         {
             get
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/StorageItemWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/StorageItemWrapper.cs
index b183f1c..6e882ab 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/StorageItemWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/StorageItemWrapper.cs
@@ -74,7 +74,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         override public string EntryID { get { return _item.EntryID; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -83,27 +83,6 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (ComRelease com = new ComRelease())
-                {
-                    NSOutlook.Folder parent = com.Add(_item.Parent);
-                    return parent?.EntryID;
-                }
-            }
-        }
-
-        override public IStore GetStore()
-        {
-            using (ComRelease com = new ComRelease())
-            {
-                NSOutlook.Folder parent = com.Add(_item.Parent);
-                return Mapping.Wrap(parent?.Store);
-            }
-        }
-
         override public void Delete() { _item.Delete(); }
 
         #endregion
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/TaskItemWrapper.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/TaskItemWrapper.cs
index 3448c82..07df207 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/TaskItemWrapper.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/Stubs/OutlookWrappers/TaskItemWrapper.cs
@@ -74,7 +74,7 @@ namespace Acacia.Stubs.OutlookWrappers
 
         override public string EntryID { get { return _item.EntryID; } }
 
-        override public IFolder Parent
+        override protected IFolder ParentUnchecked
         {
             get
             {
@@ -83,27 +83,6 @@ namespace Acacia.Stubs.OutlookWrappers
             }
         }
 
-        override public string ParentEntryID
-        {
-            get
-            {
-                using (ComRelease com = new ComRelease())
-                {
-                    NSOutlook.Folder parent = com.Add(_item.Parent);
-                    return parent?.EntryID;
-                }
-            }
-        }
-
-        override public IStore GetStore()
-        {
-            using (ComRelease com = new ComRelease())
-            {
-                NSOutlook.Folder parent = com.Add(_item.Parent);
-                return Mapping.Wrap(parent?.Store);
-            }
-        }
-
         override public void Delete() { _item.Delete(); }
 
         #endregion
diff --git a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/ZPush/FolderRegistration.cs b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/ZPush/FolderRegistration.cs
index a15262a..3d5f2b2 100644
--- a/src/AcaciaZPushPlugin/AcaciaZPushPlugin/ZPush/FolderRegistration.cs
+++ b/src/AcaciaZPushPlugin/AcaciaZPushPlugin/ZPush/FolderRegistration.cs
@@ -49,7 +49,7 @@ namespace Acacia.ZPush
 
         public override bool IsApplicable(IFolder folder)
         {
-            return folder.ItemType == _itemType;
+            return folder != null && folder.ItemType == _itemType;
         }
 
         public override string ToString()
@@ -71,6 +71,8 @@ namespace Acacia.ZPush
 
         public override bool IsApplicable(IFolder folder)
         {
+            if (folder == null)
+                return false;
             // TODO: cache folder id per store
             using (IStore store = folder.GetStore())
             {