Outlook 2007/2010 Keeps asking for Username and Password every time it is started

BackgroundEnvironment is a domain environment with a 2003 Exchange Server (Std Ed) and a separate POP/SMTP server with about 200 users. Datastore size is getting close to 70 GB. We decided to add an Exchange 2010 server and migrate the users to it.Only some users were using the Exchange Server. Most users were using the POP/SMTP server as their only e-mail server. In the beginning the Exchange...

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