The heat capacity of two glass formers 5*CB and 8*OCB, each of which has two crystalline polymorphs (phases I and II) as well as a glass phase, was determined between 0.35 K and 20 K. The T-linear term of the heat capacity becomes significant below 1 K for both glasses. The glassy crystalline phase II of 5*CB also shows such contribution, which is consistent with the existence of a residual entropy. Unexpectedly, however, the 'stable' phase II of 8*OCB shows the similar contribution, indicating that this phase is disordered, whereas the glassy crystalline phase I shows no such contribution. (c) 2008 Elsevier B.V. All rights reserved.