Allow administrator to export the user directory to a spreadsheet

I would like to export a list of all users or users by group, preferably in table/spreadsheet format, with their associated profile information. We have both external and internal users, and I need to maintain a list of each category for email communication. Since we don't email directly from Confluence, I have to manually maintain the lists. Being able to export a list to a spreadsheet would make this a lot easier.