Outlook 2013 ask credential for connecting to Exchange 2007

Hi,
i've a big problem into my business from about 2 weeks. We have deployed 5 new pc with Office 2013 Professional and Windows 7 professional, into our server we have exchange 2007 version 8.3 and build 83.6
Only for 1 client outlook works correctly but into other 4 client we have same problem. After open outlook 2013 is all ok and i see "connected to Microsoft Exchange" but after 2 minutes outlook always asks for password prompt. When i insert the
password the client request the same password into loop.
Despite asks for credential i receive correctly the emails.
From now i've tried this solution that i read online but none of these works correctly.
1- delete and create new outlook profile
2- I have changed the authentication to NTLM instead of Basic Authentication
3- Delete credential from Control Panel --> Credential Manager
4- Disable the setting "Always prompt for logon credentials"
5- try to change user password from owa
Other information:
User can access to owa and work correctly, autodiscover is running correctly because i setup the account with it.
I've tried to test outlook connection with press ctrl and left click into outlook taskbar.
Why outlook always ask me for credential? This is very frustrating because only 1 client works correcly.
I'm waiting for your kindly response.
Matteo

Hi Matteo,
What’s your Outlook connection status? Confirm your Protocol is RPC/TCP (internal) or RPC/HTTP (external)? Please try to configure your problematic account in the Outlook client which is the only one working correctly to check whether the issue persists.
If all other 4 accounts can work well in the “good” one client, please check whether there is any difference between the account settings in different PC.
Thanks,
Winnie Liang
TechNet Community Support

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Outlook 2013 Continually Prompting For Credentials

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Hello,
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