Thanks for the instructions! This really works.
Only that I’m updated the industrial cluster Exchange mailboxes 2007 SP1 with 4 nodes to Exchange 2007 SP2.
A problem occurred: update passive cluster node was failed at the last stage (and even after reboot). Some Exchange services do not started.
Solution was found in article http://technet.microsoft.com/en-us/library/cc756342 (WS. 10) .aspx. Setting ServicesPipeTimeout value to 90,000 is eliminating the problem.
My configuration : 4 x HP ProLiant DL380 G5, 20 GB RAM, Windows 2008 SP2, Exchange 2007 SCC Mailbox Role.