When Forefront TMG receives an HTTP request, it retrieves its URL category from MRS or from internal cache.
MRS is a cloud-based object categorization system hosted in Microsoft data centers and designed to provide comprehensive reputation content to enable core
trust scenarios across Microsoft solutions. In the case of Forefront TMG, in order to find out the category of a URL, TMG issues an online query to MRS. MRS maintains a database with tens of millions of unique URLs and their respective categories.
URL Filtering is Here!
how
to get list of TMG category list
Вообщем, если не вытаскивать всю базу, то никак.
