Outlook Keeps Asking for Password Credentials, Office 365.
Outlook Office 365 Configuration Does not Complete
Outlook Keeps Prompting for PasswordOutlook 2010 with SP1 installed on Windows XP with SP3 and other updates would not connect to Office 365 for email. It would not fully setup. Outlook constantly prompted the user for a password. The password was well known and being entered correctly. As previously mentioned this desktop originally had Outlook 2007 which was upgraded to Outlook 2010 and this upgrade process may not have been required at all.
Resolving Outlook Setup Not Completing with Office 365A little more back ground first to help set the stage as to why the focus was completely placed on the local desktop and environment. The user's account setup with no problem in Outlook on an off-site computer desktop. The off-site computer was not connected to the domain and there was no VPN connecting it to the domain.
The steps taken to resolve this issue consisted of :
Run Regedit and go to HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\AutoDiscover
for Outlook 2010
Add or modify the following
These keys could also be added to help prevent Outlook frm using the local CAS server if one exists on your network. In this case there was indeed a local Exchange 2007 server. The customer had migrated to Office 365 but the local Exchange server was still present on the network and int he domain.
The only look-up type that will be used now is HTTP Redirect to the XML file. If this fails, there'll be no Autodiscover. This removes local domain interference.
Microsoft Hotfix to Connect Outlook to Office 365The most generally accepted suggestion from many forums, but seems not to always work for people having this problem with Outlook connecting to Office 365, is to run Windows updates and update your operating system and Microsoft Office installation (at least Outlook 2010). As mentioned previously this particular desktop had Outlook 2007 with Office 2007, I upgraded only Outlook. Perhaps I did not need to upgrade Outlook at all. The operating system already had Service Pack 3 for Windows XP. I did not run Windows updates because I did not want to have other applications break.
Add the anonymous option to Outlook Logon Security Option list.
Instead of running every single Windows update available which did not work for many people having the similar issue with Outlook and Office 365, I ran the following a hot-fix. The hot-fix both added the Anonymous option to Outlook's configuration options and enabled Outlook to connect and fully configure to Office 365.
KB Article Number(s): 2791026 Language: All (Global) Platform: i386 Location: (hotfixv4.microsoft.com/.../462115_intl_i386_zip.exe)
KB Article Number(s): 2791026 Language: All (Global) Platform: x64 Location: (hotfixv4.microsoft.com/.../462116_intl_x64_zip.exe)