

Probably wouldn’t be a bad idea to do something along the lines of stating upfront that “if anyone in the company does anything to offend you, please report it to the appropriate channels. You’ll have our full support. We’re here to get work done, not to make people feel bad”
You’re not likely going to say by accident something they haven’t heard before, or to offend them in a new and novel way, But establishing and occasionally reinforcing the fact that they don’t have to tolerate it, that putting up with abuse is not part of their job, and that they have the boss’s backing at the same level of the non-LGBTQ employees should they find themselves being abused or offended, would probably go a decent way in minimizing the risk of something actually bad happening.
And the ease of hiring people who have experience with Microsoft clients compared with the ease of hiring people that can set up an open source version