I posted a few times about why I felt it was dangerous to rely too much on ChatGPT for your English needs in business (here and here). I also allowed ChatGPT itself to counterpoint, teaching us some of its positive points. But I would not be a fair and impartial person if I didn't acknowledge some positive points.
It can work as a proofreader. You could copy your writing into the interface and ask it to proofread. If you ask it to preserve your own words as much as possible it could be a win-win.
It could take care of some routine communication that is not vital or involving company secrets.
If you feel your business partner is sending you ChatGPT e-mails, why not return the favor?
It can keep you company if you work alone or at home. Have a fun chat with it.
I still feel it is important to stick to your own word when you are building a business connection or you need to deal with sensitive information. But I exist in the real world and understand that people will use it sometimes, much as they use Google Translate when they are short on time to write an e-mail. But always proofread it and make sure that ChatGPT is saying what you would like to be communicated on your behest.