Update Rollup 4 for Exchange Server 2007 SP1 has been released

I called Microsoft support and the following was the fix that worked for me when after installing Rollup 4 the services did not start. It seems to have something to do with getting access to a Microsoft crl URL... But anyway this registry fix seemed to have done the trick for me anyhow.

1.In Registry Editor, locate, and then right-click the following registry
subkey:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControl
2. Point to New, and then click DWORD Value. In the right pane of Registry
Editor,
notice that New Value #1 (the name of a new registry entry) is selected for
editing.
3. Type ServicesPipeTimeout to replace New Value #1, and then press ENTER.
4. Right-click the ServicesPipeTimeout registry entry that you created in step
c,
and then click Modify. The Edit DWORD Value dialog box appears.
5. In the Value data text box, enter the desired timeout value in milliseconds
and
click OK. For example, if the new service timeout should be 60 seconds (60000
milliseconds), then enter 60000.


I changed mine to 120000 and it's working ok..