Outlook 2007 login prompt repeat prompt and exchange 2010

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http://serverfault.com – It seems when I first setup a new user in Outlook 2007, a login prompt comes up and asks for credentials. After the account is setup, the login prompt will repeatedly prompt throughout the day and is a little annoying. This happened recently as all other machines are not doing this - just a few machines on the network. Any help would be much appreciated. (HowTos)