please donot get confused between ESI/PF and category of employees.
There are number of category of employees like Casual,temporary,probationer,permanent,fixed term,Badli and donot mix it with applicability of ESI/PF.
ESI and Pf acts are applicable to all category of employees from day one.
Probationer is also treat as like Company Employee in the Organizations.
Only separation in between Apprentice ship employee & Company employee on this matter.
we started an NGO in Bangalore, Karnataka and we registered under shop and Establishment.
New employees joining current month ( Probationary 6 month ) and Joining and leaving employees are more.... so as per labour law probationary employees are eligible or not for EPF and ESI