So I have a SharePoint install that is working great. I recently deployed a claims based authentication page along with a separate AD LDS instance for external users. I've got that piece working just fine along with inbound/outbound e-mail. I managed to get stuck with the Windows Explorer View for SharePoint Document Libraries though. This feature works fine if you look at the same library as a Domain User, but when using an account from the dedicated AD LDS instance this feature reports that the "client does not support this feature".
Any idea why a user out of the separate AD LDS instance would have this problem?