Hello. I'm trying to set-up two exchange e-mail accounts in outlook 2013 (Exchange server is synchronized with Active Directory).

Once I add second account and restart outlook I get password prompt from each of the accounts. And it keeps prompting all the time and one of the accounts do not work. Could you please assist me on how to set-up those multiple exchange e-mail accounts correctly ?

Hi,

You can add a secondary mailbox by the following way in Outlook 2013 provides, your primary account is permitted to open the secondary mailbox

File->Account Settings->Account Settings->Highlight  your account shown there and click on 'Change' -> More Settings->Advanced->Add->Add the mailbox there

Now both accounts can be seen in one profile. You may add multiple such accounts

Thank you but there is still something missing ? when I add a mailbox it appears in my mailbox but it says : 'Cannot display the folder. Microsoft Outlook cannot access the specified folder location. The operation failed. An object cannot be found.'

I think I need somehow to point it to that username and enter passwords somewhere to get access to that account's mailbox ? Sorry but I'm just starting to understand the exchange so would be nice if you could give me a 'noob' step-by-step :)  

This is because your primary mailbox is not having permission over the secondary mailbox. This has to be assigned at the exchange server.

The following cmdlet can help to set it. An interesting thing is after you set the full Mailbox access permission, the secondary mailbox will be appeared automatically by without doing the steps I described.

Add-MailboxPermission -Identity "UserA" -User USERB -AccessRights FullAccess -InheritanceType All

Setup the second Exchange account in one profile would always keep prompting usernam/password. This is limitation of Outlook profile.
 
To work around this, I recommand that you may use the tool as below:
 
http://www.codetwo.com/freeware/autologon/
 
Note:

This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet.