这今天刚处理了OWA进入后，注销就提示用户名和密码，无法正常注销。我找到了一个微软KB：
http://support.microsoft.com/kb/927907/en-us
最后通过修改IIS如下部分后正常：
Configure Basic authentication on the bin virtual directoryYou must change the authentication method on the bin virtual directory from Integrated Windows authentication to Basic authentication. To do this, follow these steps:
| 1. | Start Internet Information Services (IIS) Manager. |
| 2. | Expand Server_Name (local computer), expand Web Sites, expand Default Web Site, and then expand ExchWeb. |
| 3. | Right-click bin, and then click Properties. |
| 4. | Click the Directory Security tab. |
| 5. | Under Authentication and access control, click Edit. |
| 6. | Click to clear the Integrated Windows authentication check box. |
| 7. | Click to select the Basic Authentication (password is sent in clear text) check box.
Note In versions of IIS that are earlier than IIS 6.0, you must click Edit under Basic authentication before you perform step 7. |
| 8. | In the Default Domain box, type the appropriate domain name. This will be the same name that you used in the Default Domain box for the Exchange and Public virtual directories. |
| 9. | Click OK two times. |
| 10. | Right-click Default Web Site, and then click Stop. |
| 11. | Right-click Default Web Site, and then click Start. |
| 12. | Exit IIS Manager
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