You could begin describing conditions that got you a probation letter (immaturity, poor study habits, family issues, work hours, whatever). What is their job title and proposed start date?You may also include information about their probationary period, if applicable, and the date this ends. Start your letter with a brief introduction to your company and the reason for the letter. Customer: On my yearly review it is stated, "I am recommending you be placed on probation for six months. Excepted Service employees are required to complete a probationary period of one to two years. It's up to the employer - you should ask them. Be aware that they may be unwilling to do this until you pass the background check. Introduce yourself, call out the position you're applying for, and mention your key abilities. Use these free employee written warning example templates to compose your written warnings with ease and reinforce a positive culture.