Microsoft KB Archive/171427

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The information in this article applies to:


 * Collaboration Data Objects (CDO), versions 1.1, 1.21

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SYMPTOMS
There is a reproducible 4k memory leak in the Active Messaging version 1.1 folder handling process.

RESOLUTION
The only available workaround at this time is to periodically shutdown the process that is slowly consuming available memory.

STATUS
Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Steps to Reproduce the Behavior
The following code sample from a Visual Basic 5 Form will reproduce this leak. The leak can be monitored in the Windows NT Performance Monitor, or in the Windows NT Task Manager.   Private Sub Command1_Click For i = 1 To 200 Step 1 'Update counter on form to show progress Text1.Text = i        Text1.Refresh

'Dim objects, then create and logon to session Dim objSession As Object Dim objMsg As Object Set objSession = CreateObject("MAPI.Session") objSession.Logon "MyProfileName", "", False

'With the following line commented leak does not occur Set objMsg = objSession.Inbox.Messages.GetFirst

'Cleanup and logoff Set objMsg = Nothing objSession.Logoff Set objSession = Nothing Next i

End Sub

Private Sub Command2_Click Unload Me  End Sub To monitor this in the Performance Monitor:
 * 1) Place the earlier code in a Visual Basic 5 form with two command buttons and a text box, then run the form.
 * 2) Click + in the toolbar.
 * 3) In the Object dropdown, select "Process."
 * 4) In the Instance list box, select Visual Basic.
 * 5) In the Counter list box, select "Private Bytes" then select Add..
 * 6) In the Counter list box, select "Virtual Bytes" then choose Add again.

Over a period of time you will be able to note that while Private Bytes is remaining relatively stable, the Virtual Bytes will be on a slow but steady increase until the system has no available memory left to provide to the process.

The only way to recover the lost memory is to shutdown the process.