Is it possible for a particle to have all the energy of the Isolated System of particles?

We have read the Fundamental postulate of statistical mechanics which says that :

In a state of thermal equilibrium, All the accessible microstates of the system are equally probable.

Suppose a system in thermal equilibrium with total energy to be $$E$$. Now as every microstate is equally probable, Is the state in which all the energy is possessed by one particle is equally probable than other states? If yes, Why this isn't seen very often?

$$\frac{5!}{3!2!}$$