"How to enable updates
After you enable the Intelligent Message Filter in Exchange System Manager, to enable Intelligent Message Filter updates, you must create the ContentFilterState registry entry. To do this, follow these steps:
1. Click Start, click Run, type regedit, and then click OK.
2. Expand the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange
3. In the left pane, click Exchange. Then, right-click in the right pane, point to New, and then click DWORD Value.
4. Type ContentFilterState, and then press ENTER to name the new registry entry.
5. Right-click ContentFilterState, and then click Modify.
6. In the Data value box, type 1, and then click OK.
7. Quit Registry Editor.
8. In the Services snap-in, restart the Simple Mail Transfer Protocol (SMTP) service."
nalam egyelore meg nem megy, bar a WSUS konzolon mar megjelent es a KB cikk is megvan, manualisan is mehetne mar most is, vagy az AU kliensen keresztul is, de en kivarom :)