Be straightforward and concise
Write your announcement letter in a straightforward and concise so way the reader can get the information quickly and be able to refer to it easily.
Keep it short
If you are making a positive announcement, keep it short, inviting, and to the point. Demonstrate your desire to maintain a personal or business relationship, and to build morale, confidence, loyalty, and goodwill.
Motivate others to achieve the same objectives
If announcing or recognizing the achievements of others, you can, if you write appropriately, motivate others to achieve the same objectives.
Use the letter for your advantage
Your letter is a prime opportunity to build good relationships and promote your business.
Write to avoid questions later
Make the information in your announcement clear and complete, so you are not bombarded with questions later.
If you are announcing bad news, make a direct, no-nonsense statement. Temper the announcement with understanding and optimism. Your tone should be considerate and respectful.