ALTA recently announced that on August 1, 2018, both the ALTA Commitment (06-17-06) and the ALTA Short Form Commitment (10-16-08) will be decertified from the current collection of standard ALTA forms and moved to the archives. The original decertification date for the 2006 ALTA Commitment was December 31, 2017. The reason for the change in the decertification date is to have the date coincide with the decertification of the ALTA Short Form Commitment.
For more information, you can read ALTA's press release here: https://www.alta.org/news/news.cfm?20171102-Policy-Forms-Update-ALTA-Short-Form-Commitment-for-a-Short-Form-Residential-Loan-Policy