Hi Peter,
Cisco just announced the EOS/EOL for the CCM 3.X Train in January. So that bodes well for CCM 4.2.X. Have a look;
End-of-Life Milestones and Dates for the Cisco Unified CallManager Version 3
End-of-Life Announcement Date
The date the document that announces the end of sale and end of life of a product is distributed to the general public.
January 22, 2007
End-of-Sale Date
The last date to order the product through Cisco point-of-sale mechanisms. The product is no longer for sale after this date.
July 23, 2007
Last Date of Support: App. SW
The last date to receive service and support for the product. After this date, all support services for the product are unavailable, and the product becomes obsolete.
July 22, 2010
From this link;
End-of-Life and End-of-Sale Notices
http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_eol_notices_list.html
Hope this helps!
Rob
