Obviously, in formal writing, contractions are not used. But in business day to day use?
I use them in emails, memos, powerpoints and in internal documents. Recently, I got some feedback from a colleague on a long manual for employees' use and he had gone through and "corrected" every single contraction.
Is he right? The manual will not be published, but it will be available online. I love a bit of pedantry but this seems a bit old school.