Microsoft Outlook users cannot download the Offline Address Book (OAB) from a server that is running Microsoft Exchange Server 2010.
This issue can occur if an HTTPS redirection is configured incorrectly in Internet Information Services (IIS) 7. If HTTPS redirection is configured incorrectly, Web.config files may be created in the following locations:
Start Internet Information Services (IIS) Manager.
Click Default Web Site, and then double-click HTTP Redirect.
Click to clear the Redirect requests to this destination check box, and then click Apply.
Repeat step 5 for all virtual directories.
Reconfigure HTTPS redirection. For information about how to configure HTTPS redirection correctly, see the following article in the Microsoft Knowledge Base:
975341 How to redirect requests from HTTP to HTTPS or to the OWA virtual directory in IIS 7
Note When you follow the steps in the "Resolution" section for KB 975341, verify that you click to select the Only redirect requests to content in this directory (not subdirectories) check box.
Restart the IIS Admin service.
If redirection is configured in IIS 7, and the Only redirect requests to content in this directory (not subdirectories) option is not selected, the changes are populated to the subdirectories. This scenario creates a Web.config file that is not required in the following folder: