How to programmatically get the size of mailboxes in Exchange

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SUMMARY

This article describes how to programmatically retrieve information about the size of mailboxes on a server that is running Microsoft Exchange by using Microsoft Visual C, Microsoft Visual C++, Microsoft Visual Basic, and Microsoft Visual Basic Scripting Edition (VBScript).

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Extended MAPI approach

Programming Languages Available: Visual C, Visual C++
Exchange Server Versions: Exchange Server 5.5, Exchange 2000, and Exchange 2003

Extended MAPI provides the IExchangeManageStore interface to obtain management information from an Exchange information store. This interface provides the GetMailboxTable function, which returns an IMAPITable interface that contains information about the mailboxes on a particular server. Note that this function requires administrative access to the server that is running Exchange Server.

This table includes a column that provides information about the size of each mailbox. The PR_MESSAGE_SIZE property contains the size (in bytes) of the mailbox.

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
200160 How to loop through mailboxes on Exchange using GetMailboxTable

CDO 1.21 approach

Programming Languages Available: VBScript, Visual Basic, Visual C, Visual C++
Exchange Server Versions: Exchange Server 5.5, Exchange 2000, and Exchange 2003

You can use Collaboration Data Objects (CDO) 1.21 to check the same property on a user mailbox store through the CDO InfoStore object. In this approach, your application must log on to a mailbox before the application can check this property. This means that your application must have access to all mailboxes on the server. This approach also requires that you generate a list of mailboxes on the server and then loop through them in code.

The following sample is a simple VBScript code sample that can check this property on a mailbox. To use this sample, paste the following code in a new text file, and then name the file Mailboxsize.vbs:
'This script logs on to a server that is running Exchange Server and
'displays the current number of bytes that are used in the user's
'mailbox and the number of messages.

' USAGE: cscript MailboxSize.vbs SERVERNAME MAILBOXNAME

' This requires that CDO 1.21 is installed on the computer.
' This script is provided AS IS. It is intended as a SAMPLE only.
' Microsoft offers no warranty or support for this script.  
' Use at your own risk.

' Get command line arguments.
Dim obArgs
Dim cArgs

Set obArgs = WScript.Arguments
cArgs = obArgs.Count

Main

Sub Main()
   Dim oSession
   Dim oInfoStores
   Dim oInfoStore
   Dim StorageUsed
   Dim NumMessages
   Dim strProfileInfo
   Dim sMsg

   On Error Resume Next

   If cArgs <> 2 Then
      WScript.Echo "Usage: cscript MailboxSize.vbs SERVERNAME MAILBOXNAME"
      Exit Sub
   End If

   'Create Session object.
   Set oSession = CreateObject("MAPI.Session")
   if Err.Number <> 0 Then
      sMsg = "Error creating MAPI.Session."
      sMsg = sMsg & "Make sure CDO 1.21 is installed. "
      sMsg = sMsg & Err.Number & " " & Err.Description
      WScript.Echo sMsg
      Exit Sub
   End If
    
   strProfileInfo = obArgs.Item(0) & vbLf & obArgs.Item(1)

   'Log on.
   oSession.Logon , , False, True, , True, strProfileInfo
   if Err.Number <> 0 Then
      sMsg = "Error logging on: "
      sMsg = sMsg & Err.Number & " " & Err.Description
      WScript.Echo sMsg
      WScript.Echo "Server: " & obArgs.Item(0)
      WScript.Echo "Mailbox: " & obArgs.Item(1)
      Set oSession = Nothing
      Exit Sub
   End If

   'Grab the information stores.
   Set oInfoStores = oSession.InfoStores
   if Err.Number <> 0 Then

      sMsg = "Error retrieving InfoStores Collection: "
      sMsg = sMsg & Err.Number & " " & Err.Description
      WScript.Echo sMsg
      WScript.Echo "Server: " & obArgs.Item(0)
      WScript.Echo "Mailbox: " & obArgs.Item(1)
      Set oInfoStores = Nothing
      Set oSession = Nothing
      Exit Sub
   End If
    
   'Loop through information stores to find the user's mailbox.
   For Each oInfoStore In oInfoStores
      If InStr(1, oInfoStore.Name, "Mailbox - ", 1) <> 0 Then
         '&HE080003 = PR_MESSAGE_SIZE
         StorageUsed = oInfoStore.Fields(&HE080003)
         if Err.Number <> 0 Then
            sMsg = "Error retrieving PR_MESSAGE_SIZE: "
            sMsg = sMsg & Err.Number & " " & Err.Description
            WScript.Echo sMsg
            WScript.Echo "Server: " & obArgs.Item(0)
            WScript.Echo "Mailbox: " & obArgs.Item(1)
            Set oInfoStore = Nothing
            Set oInfoStores = Nothing
            Set oSession = Nothing
            Exit Sub
         End If
         
         '&H33020003 = PR_CONTENT_COUNT
         NumMessages = oInfoStore.Fields(&H36020003)

         if Err.Number <> 0 Then

            sMsg = "Error Retrieving PR_CONTENT_COUNT: "
            sMsg = sMsg & Err.Number & " " & Err.Description
            WScript.Echo sMsg
            WScript.Echo "Server: " & obArgs.Item(0)
            WScript.Echo "Mailbox: " & obArgs.Item(1)
            Set oInfoStore = Nothing
            Set oInfoStores = Nothing
            Set oSession = Nothing
            Exit Sub
         End If

         sMsg = "Storage Used in " & oInfoStore.Name
         sMsg = sMsg & " (bytes): " & StorageUsed
         WScript.Echo sMsg
         WScript.Echo "Number of Messages: " & NumMessages
      End If
   Next

   ' Log off.
   oSession.Logoff

   ' Clean up memory.
   Set oInfoStore = Nothing
   Set oInfoStores = Nothing
   Set oSession = Nothing 
End Sub
				

ActiveX Data Objects (ADO) approach

Programming Languages Available: VBScript, Visual Basic, Visual C, Visual C++
Exchange Server Versions: Exchange 2000 and Exchange 2003

In Exchange 2000 and Exchange 2003, you can access the Exchange information store through ActiveX Data Objects (ADO). No property that is stored on the mailbox contains the total size. However, each folder in a user mailbox has its size stored in a field that is named http://schemas.microsoft.com/mapi/proptag/x0e080003. This corresponds to the MAPI property, PR_MESSAGE_SIZE.

By adding the size of all of the folders in a user mailbox, the total size of the mailbox can be computed. To do this, you use a SHALLOW traversal to recursively traverse the folders in the mailbox. Although you can use a DEEP traversal, this approach is avoided because of the issues that DEEP traversal raises. For additional information about the issues with a DEEP traversal, click the following article number to view the article in the Microsoft Knowledge Base:
216076 Accessing Information Store folders may become slow
In this approach, you must run your code on the server that is running Exchange 2000. OLE DB Provider for Exchange (EXOLEDB) cannot access mailboxes remotely.

The following sample is a simple VBScript code sample that can retrieve the size of a mailbox. To use this sample, paste the following code in a new text file, and then name the file Mailboxsize.vbs:
'This script logs on to a server that is running Exchange 2000 or 2003 and
'displays the current number of bytes that are used in the user's
'mailbox.

' USAGE: cscript MailboxSize.vbs DOMAINNAME MAILBOXNAME

' You must run this code on the computer that is running Exchange 2000 or 2003.
' This script is provided AS IS. It is intended as a SAMPLE only.
' Microsoft offers no warranty or support for this script.  
' Use at your own risk.

' Get command line arguments

Dim obArgs
Dim cArgs
Dim iSize

Set obArgs = WScript.Arguments
cArgs = obArgs.Count

Main

Sub Main()
   Dim sConnString

   On Error Resume Next

   If cArgs <> 2 Then
      WScript.Echo "Usage: cscript MailboxSize.vbs DOMAINNAME MAILBOXNAME"
      Exit Sub
   End If

   ' Set up connection string to mailbox.
   sConnString = "file://./backofficestorage/" & obArgs.Item(0)
   sConnString = sConnString & "/mbx/" & obArgs.Item(1) & "/NON_IPM_SUBTREE"
   WScript.Echo sConnString

   iSize = 0

   RecurseFolder(sConnString)

   WScript.Echo "Mailbox Size: " & iSize
End Sub

Public Sub RecurseFolder(sConnString)
   Dim oConn
   Dim oRecSet
   Dim sSQL

   ' Set up SQL SELECT statement.
   sSQL = "SELECT ""http://schemas.microsoft.com/mapi/proptag/x0e080003"", "
   sSQL = sSQL & """DAV:href"", "
   sSQL = sSQL & """DAV:hassubs"" "
   sSQL = sSQL & "FROM SCOPE ('SHALLOW TRAVERSAL OF """ & sConnString
   sSQL = sSQL & """') WHERE ""DAV:isfolder"" = true"
   WScript.Echo sSQL

   ' Create Connection object.
   Set oConn = CreateObject("ADODB.Connection")
   if Err.Number <> 0 then
      WScript.Echo "Error creating ADO Connection object: " & Err.Number & " " & Err.Description
   end if

   ' Create RecordSet object.
   Set oRecSet = CreateObject("ADODB.Recordset")
   if Err.Number <> 0 then
      WScript.Echo "Error creating ADO RecordSet object: " & Err.Number & " " & Err.Description
      Set oConn = Nothing
      Exit Sub
   end if

   ' Set provider to EXOLEDB.
   oConn.Provider = "Exoledb.DataSource"

   ' Open connection to folder.
   oConn.Open sConnString
   if Err.Number <> 0 then
      WScript.Echo "Error opening connection: " & Err.Number & " " & Err.Description
      Set oRecSet = Nothing
      Set oConn = Nothing
      Exit Sub
   end if

   ' Open Recordset of all subfolders in folder.
   oRecSet.CursorLocation = 3
   oRecSet.Open sSQL, oConn.ConnectionString
   if Err.Number <> 0 then
      WScript.Echo "Error opening recordset: " & Err.Number & " " & Err.Description
      oRecSet.Close
      oConn.Close
      Set oRecSet = Nothing
      Set oConn = Nothing
      Exit Sub
   end if

   if oRecSet.RecordCount = 0 then
      oRecSet.Close
      oConn.Close
      Set oRecSet = Nothing
      Set oConn = Nothing
      Exit Sub
   end if

   ' Move to first record.
   oRecSet.MoveFirst
   if Err.Number <> 0 then
      WScript.Echo "Error moving to first record: " & Err.Number & " " & Err.Description
      oRecSet.Close
      oConn.Close
      Set oRecSet = Nothing
      Set oConn = Nothing
      Exit Sub
   end if

   ' Loop through all of the records, and then add the size of the 
   ' subfolders to obtain the total size.
   While oRecSet.EOF <> True
      ' Increment size.
      iSize = iSize + oRecSet.Fields.Item("http://schemas.microsoft.com/mapi/proptag/x0e080003")      

      ' If the folder has subfolders, recursively call RecurseFolder to process them.
      If oRecSet.Fields.Item("DAV:hassubs") = True then
         RecurseFolder oRecSet.Fields.Item("DAV:href")
      End If
      ' Move to next record.
      oRecSet.MoveNext
      if Err.Number <> 0 then
         WScript.Echo "Error moving to next record: " & Err.Number & " " & Err.Description
         Set oRecSet = Nothing
         Set oConn = Nothing
         Exit Sub
      end if
   wend

   ' Close Recordset and Connection.
   oRecSet.Close
   if Err.Number <> 0 then
      WScript.Echo "Error closing recordset: " & Err.Number & " " & Err.Description
      Set oRecSet = Nothing
      Set oConn = Nothing
      Exit Sub
   end if

   oConn.Close
   if Err.Number <> 0 then
      WScript.Echo "Error closing connection: " & Err.Number & " " & Err.Description
      Set oRecSet = Nothing
      Set oConn = Nothing
      Exit Sub
   end if

   ' Clean up memory.
   Set oRecSet = Nothing
   Set oConn = Nothing
End Sub
				
For additional information about this topic and a Visual C++ sample that retrieves the size of mailboxes, click the following article number to view the article in the Microsoft Knowledge Base:
291368 How to determine the size of Exchange 2000 Server mailbox with ADO in C++

WebDAV approach

Languages: VBScript, Visual Basic, Visual C
Exchange Server Versions: Exchange 2000 and Exchange 2003

You can also use WebDAV similarly to the ADO approach. The property and the algorithm are the same in that you can add the values of http://schemas.microsoft.com/mapi/proptag/x0e080003 from all of the subfolders in a mailbox. One advantage of using WebDAV instead of ADO is that the code does not have to run on the computer that is running Exchange 2000 or Exchange 2003.

To use this sample, paste the following code in a new text file, and then name the file Mailboxsize.vbs:
'This script logs on to a server that is running Exchange Server and
'displays the current number of bytes that are used in the user's
'mailbox.

' USAGE: cscript MailboxSize.vbs SERVERNAME MAILBOXNAME USERNAME PASSWORD

' SERVERNAME: Name of your Exchange Server

' MAILBOXNAME: Your alias (Note: depending on your environment, you may need to use the portion of your 
' SMTP address left of the '@' symbol instead of your alias.

' USERNAME: Your domainname\username '

' PASSWORD: Your domain password 
' This script is provided AS IS. It is intended as a SAMPLE only.
' Microsoft offers no warranty or support for this script. 
' Use at your own risk. 

' Get command line arguments.

Dim obArgs
Dim cArgs
Dim iSum

Set obArgs = WScript.Arguments
cArgs = obArgs.Count

Main

Sub Main()
   Dim sUrl
   Dim sMsg

   On Error Resume Next

   iSum = 0

   ' Check argument count.
   If cArgs <> 4 Then
      sMsg = "Usage: cscript MailboxSize.vbs "
      sMsg = sMsg & "SERVERNAME MAILBOXNAME USERNAME PASSWORD"
      WScript.Echo sMsg 
      Exit Sub
   End If

   sUrl = "http://" & obArgs.Item(0) & "/exchange/" & obArgs.Item(1) & "/NON_IPM_SUBTREE"
   wscript.echo sUrl

   RecurseFolder(sUrl)

   WScript.Echo "Mailbox Size: " & iSum
End Sub

Public Sub RecurseFolder(sUrl)
   Dim oXMLHttp
   Dim oXMLDoc
   Dim oXMLSizeNodes
   Dim oXMLHREFNodes
   Dim oXMLHasSubsNodes
   Dim sQuery

   Set oXMLHttp = CreateObject("Microsoft.xmlhttp")
   If Err.Number <> 0 Then
      WScript.Echo "Error Creating XML object"
      WScript.Echo Err.Number & ": " & Err.Description
      Set oXMLHttp = Nothing
   End If

   ' Open DAV connection.
   oXMLHttp.open "SEARCH", sUrl, False, obArgs.Item(2), obArgs.Item(3)
   If Err.Number <> 0 Then
      WScript.Echo "Error opening DAV connection"
      WScript.Echo Err.Number & ": " & Err.Description
      Set oXMLHttp = Nothing
   End If

   ' Set up query.
   sQuery = "<?xml version=""1.0""?>"
   sQuery = sQuery & "<g:searchrequest xmlns:g=""DAV:"">"
   sQuery = sQuery & "<g:sql>SELECT ""http://schemas.microsoft.com/"
   sQuery = sQuery & "mapi/proptag/x0e080003"", ""DAV:hassubs"" FROM SCOPE "
   sQuery = sQuery & "('SHALLOW TRAVERSAL OF """ & sUrl & """') "
   sQuery = sQuery & "WHERE ""DAV:isfolder"" = true"
   sQuery = sQuery & "</g:sql>"
   sQuery = sQuery & "</g:searchrequest>"

   ' Set request headers.
   oXMLHttp.setRequestHeader "Content-Type", "text/xml"
   oXMLHttp.setRequestHeader "Translate", "f"
   oXMLHttp.setRequestHeader "Depth", "0"
   oXMLHttp.setRequestHeader "Content-Length", "" & Len(sQuery)

   ' Send request.
   oXMLHttp.send sQuery
   If Err.Number <> 0 Then
      WScript.Echo "Error Sending Query"
      WScript.Echo Err.Number & ": " & Err.Description
      Set oXMLHttp = Nothing
   End If 

   ' Load XML.
   Set oXMLDoc = oXMLHttp.responseXML

   ' Get the XML nodes that contain the individual sizes.
   Set oXMLSizeNodes = oXMLDoc.getElementsByTagName("d:x0e080003")

   ' Get the XML nodes that contain the individual HREFs.
   Set oXMLHREFNodes = oXMLDoc.getElementsByTagName("a:href")

   ' Get the XML nodes that contain the individual HasSubs.
   Set oXMLHasSubsNodes = oXMLDoc.getElementsByTagName("a:hassubs")

   ' Loop through the nodes, and then add all of the sizes.
   For i = 0 to oXMLSizeNodes.length - 1
      WScript.Echo oXMLHREFNodes.Item(i).nodeTypedValue
      WScript.Echo "Size: " & oXMLSizeNodes.Item(i).nodeTypedValue
      iSum = iSum + oXMLSizeNodes.Item(i).nodeTypedValue

      ' If the folder has subfolders, call your recursive function to 
      ' process subfolders.
      If oXMLHasSubsNodes.Item(i).nodeTypedValue = True Then
         RecurseFolder oXMLHREFNodes.Item(i).nodeTypedValue
      End If
   Next

   ' Clean up.
   Set oXMLSizeNodes = Nothing
   Set oXMLDoc = Nothing
   Set oXMLHttp = Nothing
End Sub
				

Note In addition to the programmatic methods that are described in this section, you can also export folder size information to a text file by using Exchange System Manager.

Properties

Article ID: 320071 - Last Review: October 25, 2007 - Revision: 6.5
APPLIES TO
  • Microsoft Exchange Server 2003 Enterprise Edition
  • Microsoft Exchange Server 2003 Standard Edition
  • Microsoft Exchange 2000 Server Standard Edition
  • Microsoft Exchange Server 5.5 Standard Edition
Keywords: 
kbhowto KB320071

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