Public Folder ESM Error in Exchange

If you get the following error in Exchange “The token supplied to the function is invalid. ID no:
80090308 Exchange System Manager” you can do the following to fix it.

1. In the properties of the virtual root Exadmin in IIS, go to the “Directory Security” tab
2. In the “Secure Communications” section select “Edit”.
3. Make sure to deselect “Require secure channel (SSL)” and “Require 128-bit encryption.”
4. If the “Require 128-bit encryption.” is selected and greyed out, make sure to select “Require secure channel (SSL)” and deselect “Require 128-bit encryption.” then deselect “Require secure channel (SSL)” again.
5. Goto Start – Programs – Windows 2000 Support Tools – Tools and launch ADSI Edit.
6. In the left side pane expand the Configuration container.
7. Next expand CN=Configuration
8. Then CN=Services
9. CN=Microsoft Exchange
10. CN=
11. CN=Administrative Groups
12. CN=First Administrative Group site name>
13. CN=Servers
14. CN=Protocols
15. CN=HTTP
16. CN=1
17. Right Click on CN=Exadmin and choose Properties.
18. In the Properties dialog box you will see 2 drop-down lists. drop down the top list and select “Both”. Drop down the second list and scroll down to the attribute “msExchSecureBindings” and double click on it.
19. If this attribute is set to 443 or any other value really, click the 443 value to select it and click the “Remove” button. Then click “Apply” and then “OK”
20. Close out of ADSI Edit, close and reopen Exchange System Manager and test Public Folder access again.