Sorry I missed your post.
Why would you want to use it if it's out of print? In my opinion, the best solution would be to check out the publishers' online catalogues of English Language method books for business and choose something that is up to date and in print. Look at those of other publishers too, such as Cambridge University Press, Oxford University Press, Longman, Pearson, etc. You could also run a Google search for simply Business English. if you are working for an established organisation, the publisher might send you a free inspection copy, although this is becoming rarer now that sample pages are often published on their websites.