Inviting to share calendar

I work in an office where I'm the only Apple user. At first, I was synced up with the office email on my MacBook, iPhone, and iPad but now that we're on MS Outlook and Exchange I'm out of the loop. I'm able to get my email again and I can receive invites to share others calendars but I don't know how to share my calendar with others. I'm sure there's a simple solution I'm missing. Any suggestions or tips?