Outlook 2007/2010 prompting for passwords

I had migrated exchange 2007 server to exchange 2010 with DAG,when outlook is configured in cached mode, outlook prompts for user credentials every now and then.if i remove the cache mode then its fine, this issue is for all the users.
rahimpaAsked:
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setasoujiroCommented:
How are the users connecting? is this via outlook anywhere?
also when you get the prompt box, where is it trying to auth. to? it's in the top bar.
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rahimpaAuthor Commented:
yes its via outlook anywhere,  yes its in the top bar
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setasoujiroCommented:
no i mean is the correct hostname in the top bar?
also how do you authenticate?
basic or ntlm?
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