SharePoint 2010: xmlhttp file uploads fail

I have used the attached VBA code siccessfully in other applications to upload xml and html files to other instances of Sharepoint, but in a new Sharepoint 2010 installation the uploaded files appear to be processing correctly, and the procedure completes without error, but the files are not being written to the destination SP folder. The SP admin tells me that that he knows of no SP settings that might prevent writing to the folder programmatically, and that the folder is email enabled (if that is relevant here). Does anybody have any suggestions?
Public Sub CopyToSharePoint()

On Error GoTo err_Copy

Dim xmlhttp
Dim sharepointUrl
Dim sharepointFileName
Dim tsIn
Dim sBody
Dim LobjXML As Object
Dim UserName As String
Dim pw As String
Dim RetVal
Dim i As Integer
Dim TotFiles As Integer
Dim Start As Date, Finish As Date
Dim fso As New Scripting.FileSystemObject
Dim fldr As folder
Dim f As File

Set fldr = fso.GetFolder("c:\FilesToUpload\")

UserName = DLookup("[Username]", "tbl_UserData")
pw = DLookup("[Password]", "tbl_UserData")
sharepointUrl = ""

Set LobjXML = CreateObject("Microsoft.XMLHTTP")

TotFiles = fldr.Files.Count

For Each f In fldr.Files

 sharepointFileName = sharepointUrl & f.Name

    Set tsIn = f.OpenAsTextStream
    sBody = tsIn.ReadAll

    Set xmlhttp = CreateObject("MSXML2.XMLHTTP.6.0")

    xmlhttp.Open "PUT", sharepointFileName, False, UserName, pw

    xmlhttp.Send sBody

  i = i + 1

  RetVal = SysCmd(acSysCmdSetStatus, "File " & i & " of " & TotFiles & " copied...")

Next f

   RetVal = SysCmd(acSysCmdClearStatus)

  Set LobjXML = Nothing

  Set fso = Nothing


MsgBox Err & " " & Err.Description

If Err <> 0 Then
  MsgBox Err & " " & Err.Description
  Resume Next
End If

End Sub

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dgmoore1Connect With a Mentor Author Commented:
I discovered the problem - the credentials passed to the server must include the domain. When I added the domain to the credentials everything clicked.
Check to see if versioning is on and if so, are you creating unpublished versions?
dgmoore1Author Commented:
I'm not sure what you mean by unpublished versions. The uploaded files are updated daily in most cases, and overwrite whatever is currently in the folder. There is no intention of maintaining different versions of the same files. In any case, the folder I'm trying to write to is currently empty so there would be no conflict between uploaded files and files with the same names that are already present.
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dgmoore1Author Commented:
I just added MsgBox xmlhttp.status after the xmlhttp.send statement. I'm getting 401 Access denied. The credentials I'm passing are valid - any idea what could be preventing access?
If versioning is on, then changes will not go into effect (viewable by read only users) until a published or full version is checked in.

Check to see what security settings are enabled in IIS.  I suspect that basic auth was turned on previously and now it is not.
dgmoore1Author Commented:
I found the solution myself
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