If you are looking to attract clients the world over it a great idea to consider how you present your sales letters. In many cases, regardless of geographical location, you will be able to find potential clients who speak your native language, but if you want to maximize the efficiency of your sales campaign, it may be a good idea to have your sales material translated into the language of your target market. This way you can be sure that your message will be understood and it's full impact felt by its recipients. Sales letters are meant to be personal and I can't think of any think more personal for a multinational company to do than to tailor fit it's sales message to a specific geographical demographic.