Outlook 2007 prompts you repeatedly for a password under certain network conditions

KB Article: https://support.microsoft.com/kb/956531

INTRODUCTION

Under certain network conditions, Microsoft Office Outlook 2007 prompts you repeatedly for a password. If you do not enter a password or if you enter an incorrect password, Outlook 2007 may silently enter Offline mode. In this case, you do not receive an error message or a notification, and you will not be connected to the mailbox.