I am working with an internet service provider. I wish to update my clients about new products which has come into place. What would be an appropriate way to address them all.

Some brief about clients.

My clients range from Rs. 100-1000 crore in turnover.

Please suggest the best possible formal letter to inform on the same.

Reg
Zeal

Hello Zeal !

Are you going to contact them by email or by (slow) mail?

From your Rs I assume you live in India. Is that correct?
That's important to know, as there is a huge difference in addressing people in the Far East, Europe, and US/Canada.

:)