Is it OK to install CDO 1.21 with Exchange Server

Question

We are upgrading our server to Windows 2012 from 2003. Our application use CDO 1.21 and MAPI to send mails, I know I have to use SMTP/ OOM/AWS. At this late stage I don't want to do make changes in our programs right now - there are 80+ :)

When I am going to MS site to download CDO 1.21, Windows 2102/Exchange Server 2010 SP3 is not specified under supported platforms.

I am able to download CDO 1.21 for Win 2012. But now when I am connecting via MAPI, System is throwing error:

The information store could not be opened. [MAPI 1.0 - [MAPI_E_LOGON_FAILED(80040111)]]

MAPI Code :

   Set objMAPI = New MAPI.Session
  objMAPI.Logon ShowDialog:=False, NewSession:=False, ProfileInfo:=gobjINI.gstrExchangeServer & vbLf & gobjINI.gstrProfile

'Add a new mesage to the OUtbo Messages Collection
Set objMSG = objMAPI.Outbox.Messages.Add

Error is thrown on third line: Set objMSG = objMAPI.Outbox.Messages.Add.