The LEED Guidebook cites the ASHRAE 2007 Handbook as reference material and the sample Building Operating Plan has an entry for "outside air" indicating comliance to ASHRAE 62.1-2007.

My question:
1) Does the Building Operation Plan have to comply with the latest ASHRAE Standard, in this case 62.1-2007 or is compliance w/ earlier versions acceptable?
2) If compliance with earlier versions is acceptable, how early a version will be acceptable to LEED?

I ask since my client's building has been in operation since 1991, although they have done a good job updating their facility.