Failed to connect to PST file using MAPI   

I am writing program for fetching data from Exchange sever and PST files.
 Program faces following four scenarios for connections
1.	Repeatedly connect to exchange server 
2.	Repeatedly connect to PST file 
3.	First connect to exchange server and then to PST file 
4.	First connect to PST file and then to Exchange server. 

However, third scenario is not working (i.e. After connecting to exchange 
sever, I am not able to connect to PST file). In this scenario, Code to 
connect to PST file, fails in IMsgServiceAdmin::ConfigureMsgService with 
MAPI_E_NO_ACCESS error. Error message displayed is as follows

"The file E:\Outlook.pst has changed since you last run Microsoft Office 
Outlook. The change will take effect next time you start Outlook"

Please Note:
	For each connection, separate temporary MAPI profile and MAPI session is 
created. 	
After each connection termination, all varibles are released, profile is 
deleted, IMAPISession::Logoff  and MAPIUninitialize is called.

        Can anyone help me out why this error comes? 
Any help on this will be greatly appreciated,

Thanks,
Rohit

url:http://www.ureader.com/gp/1651-1.aspx

date: Fri, 14 Mar 2008 13:52:02 +0800   author:   Rohit Gattani