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Log on to exchange server failed

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Hi,
I have developed an application in VB.NET 2005 which downloads xml attachments. I have used CDO for reading mails from the exchange server.
Application reads mails in the mails box after every 3 minutes (Timer is set to 3 minutes). If there are new mails in the inbox than it downloads xml attached to mail and make that mail as read.
Application starts at 8.00 a.m. and stops at 5.00 p.m. automatically.
I have installed this application on two different machines.
Its working properly on machine but doesn't work on other machine.
Between 4.30 to 4.40 p.m. it asks popups login window of exchange server and request for username and password of that particular mailbox on the exchange server from which application is reading mails. And application stops reading mails from the mailbox.

Thanks In advance.
May 6 '09 #1
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