I use Outlook 2010 on a domain-joined workstation. It doesn't typically prompt me for credentials, but rather my domain credentials are used.
I connected a SP2010 list to Outlook 2010:
- Browse to list in SP2010 (no prompt for credentials; again, my domain creds are used)
- Under List Tools > List (in the Ribbon), select "Connect to Outlook"
- Observe that the list has appeared in Outlook's "Tasks" pane
- Reboot the computer
- Restart Outlook
- Observe a password prompt (title bar: "Windows Security") asking for my domain creds
Steps 4-6 are infinitely repeatable. Less than a minute after starting Outlook 2010, I'm prompted. I give it my domain creds and it doesn't appear again unless I reboot the machine (restarts of Outlook don't cause the prompt... until I reboot). The SP2010 list is available in Outlook 2010.
How can I prevent this prompt from appearing while still consuming my SharePoint 2010 list from within Outlook 2010?