Delete Outlook Calendar Appointments

I am trying to delete all my Outlook Calendar Appointments within a specific date range. But I don't want to delete any appointments that are set to a recurrence since they could be in the future. I found this code online and it works good except that it will delete the recurrence appointments too. Can anyone help me modify this to NOT include recurrence appointments? My VBA skills are terrible and even worse with Outlook.

Private Function DeleteAppts()
'Declarations
Dim strCurrent As String
Dim objApp As Outlook.Application
Dim objNS As Outlook.NameSpace
Dim objFolder As Outlook.MAPIFolder
Dim objItems As Outlook.Items
Dim objItem As Object
Dim strStart As String
Dim strEnd As String
Dim strFilter As String
'put required start and end dates into strStart and strEnd respectively
'if they are constants then just set them before this
'I created textboxes for users to input the dates themselves
 
strStart = "09/15/2016 07:00 AM"
strEnd = "09/15/2016 16:00 PM"
'create a string to use to filter the outlook items
strFilter = "[Start] >= " & Quote(strStart) & " And [Start] < " & Quote(strEnd)
 
'set the outlook objects and specify the items in the calendar using the filter
Set objApp = CreateObject("Outlook.Application")
Set objNS = objApp.GetNamespace("MAPI")
Set objFolder = objNS.GetDefaultFolder(olFolderCalendar)
Set objItems = objFolder.Items.Restrict(strFilter)
Set objItem = objItems.GetFirst
 
intCount = objItems.Count
For i = intCount To 1 Step -1
    Set objItem = objItems(i)
    objItem.Delete
Next

'clears out outlook objects from memory
Set objApp = Nothing
Set objNS = Nothing
Set objFolder = Nothing
Set objItems = Nothing
Set objItem = Nothing
MsgBox "Items Deleted!"
 
End Function

Function Quote(MyText) As String

    Quote = Chr(34) & MyText & Chr(34)

End Function

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