Yes. Look for the Skype for Business app for your mobile device. After you install the app, use your email address (email@example.com)
as the sign-in address and ua\username as the domain under advanced settings.
Yes. When you create a Skype for Business meeting from Outlook, attendees can join
using Skype for Business if they have it installed or they can download the Skype
for Business web app to join the meeting in their browser.