Are you sure it really hangs rather than return error that your code does
not expect?
What is different between these two apps? Are they regular UI apps?

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-
"AVIS" wrote in message
...
I have two applications developed in Visual Basic. Both the applications
use
REDEMPTION to communicate with EXCHANGE SERVER. The main application just
hangs when the following command is executed, whereas the same command is
executed perfectly fine with the second application.

Call oRDOSession.LogonExchangeMailbox(ExchangeId, ExchangeServer)

Can anyone suggest or help, to resolve the problem.

Thanks in advance for the help.