Need to share Outlook calendar outside organization

My work Outlook calendar will not share consistently with my wife who is outside of my organization. It shares fine with my gmail account but not hers. My hope was that I could convert my Outlook calendar to eM Client and share it with her that way. But I would still need to sync back to my Outlook from eM. I see now that by default eM just passes through the calendar from Outlook and won’t let me share it. I would have to go through Outlook which has not been working. Any suggestions?