Outlook 2010 prompt for credential when connecting to Exchange 2013 mailbox

I have 4 server Exchange 2010 with DAG and one server Exchange 2013, i've migrated some mailbox to the new 2013 server.
I'm having a problem with some Outlook 2010 that sometimes (not always) requires credential to connect to mailbox in a server Exchange 2013, but only
when Cache mode is enabled.
The client ask for credential and dont connect to mailbox until I change in online mode.
In Online Mode, everything works fine.
I don't have Public Folders, so the check box Download Public Folder is not selected and the authentication mode is "Negotiate".
Thanks in advance.
Elisa

Hi,
As far as I know, by default, shared mail folders not public folders are downloaded in Cached mode in Outlook 2010 and Outlook 2013:
http://support.microsoft.com/kb/982697/en-us
Please check if there is shared folder in the problematic Outlook 2010 client and try to check if the issue still exists with the same account on other Outlook client.
Best regards,
Angela Shi
TechNet Community Support

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