From the SatPhoneStore
Known end of life schedule for Inmarsat services:
Services terminated June 30, 2013
Large Antenna Mini-M (aka LAMM, aka Provident, aka GAN - originally set for termination December 31, 2012 but extended until June 30, 2013)
Services terminating December 31, 2014
Inmarsat-M (aka Standard-M). Replaced by Fleet Broadband 250/500.
Inmarsat D+ (Position reporting - i.e. Satamatics, Older Polestar DSAS MK 1 Purplefinder ). Replaced by IsatDataPro (aka IDP used in new Polestar DSAS MK II Purplefinder) .
All land versions of Mini-M (Mini-M had 4 antenna types: Marine, Portable, Provident, and Voyager). Replaced by BGAN.
Services terminating December 31, 2016
Inmarsat-B. Replaced by Fleet Broadband 250/500.
Inmarsat Mini-M Marine. Replaced by Fleet Broadband 150 and Fleet Phone.
Services without termination dates
Fleet-77 (Although no official termination date has been set, the new I-4 and I-5 satellites do not support Fleet-77 technology, and the I-3 satellites that do support Fleet-77 are expected to start failing well before the end of 2018 (a function of fuel consumption). Inmarsat is recommending users migrate off of Fleet-77 by the end of 2016). Replaced by Fleet Broadband 500.
Fleet Broadband 500 terminals only are expected to receive GMDSS certification toward the end of 2014 (Before Inmarsat-B service is terminated). FB250 terminals may or may not get certified at a later time and FB150 likely never will.
More here: Inmarsat Mini-M is EOL. Which Inmarsat Products will Replace it?