As our Exchange servers are not in the same domain as your local machines, Outlook will prompt for your password every time a connection to the server is made. This document discusses making a change to Microsoft Outlook so that the Exchange server password is remembered.
Once Outlook has loaded, select Tools, followed by Account Settings.
Next click on your Exchange account, and click on Change.
Click on More Settings followed by Security, and set the Logon Network security to Password Authentication (NTLM).
Next, click Apply followed by OK.
Click Next and Finish to close the remaining windows and return to the Outlook desktop.
Outlook should then remember your account password the next time you enter it.