Failed to connect to PST file using MAPI

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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
.

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