I only recently started working in an office environment. Apologies if this question seems obvious.
My company uses Skype for Business so I can see when my coworkers are in meetings/free/away/etc. I had a quick question for someone but noticed that she was marked as "Busy" so I sent an email instead so that it would not be as disruptive and not demand immediate attention. She answered quickly but afterward I saw that her status was now "Do Not Disturb".
Was it inappropriate for me to email her while she was "Busy" or was this likely coincidental? If someone is marked as "Do Not Disturb" should I not even email them? I am confused about when and how to contact my coworkers so that I do not bother them.
Edit: I am working in IT and am in the United States.