To put an employee on probation is to assess his suitability for the work he has been appointed for, to judge his adaptation to the company's rules, culture, ethos, values, and philosophy.
If an employee, upon completion of his probationary period, fulfills all these requirements, he deserves to be confirmed in the service of the company.
It is always advisable to include a clause in the appointment letter such as: "You may be confirmed, in writing, in the employment of the company if your performance is found satisfactory and commensurate with the expectations of the management during the probation period or any extended period but not exceeding 01 year."
If not communicated in writing, you will continue to be on probation.
Such a clause puts the employer on a safer side - they will be able to assess the employee for his suitability, and if found unsatisfactory, he may be asked to resign.
If such a clause is not mentioned, the employee may automatically get confirmed regardless of his suitability.
Moreover, confirming a deserving employee timely is a good retention tool as well.
Shabbir