If you were to never do another certification again and let them all expire which ones would you be left with? This includes not doing CE to maintain certifications.
A+ , N+ and S+ all have expired for me since I took security + after the do not expire deadline. Those are gone
CAPM expires in 2017
RMP expired next year
Prince 2 Foundation expired I believe
ITIL V3 F and the two ITIL's intermediates I have never expire
MCAS / MOS doesn't expired but it's 2007

MS Project 2010 still relavent but it will lose value shortly
Server + lifetime
Project + lifetime
I still have my MBA and BS so I should always remain competitive for educational requirements.
Just curious and being nosey.