Exchange processing wizard shows "HTTP Status 404: Not Found." When selecting objects to process (4266287)

When using the "Process selected objects only" option in the Select objects sections of the Exchange Processing Wizard, selecting certain objects may produce an alert window with the following error:

Cannot expand 'Lastname, Firstname'. Could not enumerate mailbox folder. The request failed with HTTP status 404: Not Found.

Similar errors will be present in the EXPW trace log file as well. This can also apply to public folders.

Workaround:

Create a new Exchange Processing task, and when adding the Exchange servers involved, specify a known good Gobal Catalog server. This should allow selection of the items that previously triggered the 404 error.