Free

Office 365 - FindTime - Share your Calendar with your internal and Third Parties

FindTime is an Outlook add-in or Web Based Tools that allows you to quickly find time to meet with others Internally or Externally - something that can take weeks without FindTime! FindTime helps you pinpoint times to meet by looking at available free/busy data for your attendees as well as creating a poll where attendees can vote on the times you suggest, and even suggest new times themselves!

FAQ

Do recipients also need to have FindTime installed?

Nope! Your friends and colleagues only need an email address and Internet access in order to be a recipient. You are certainly welcome to spread the love and invite them to install FindTime, however, and become an organizer!

Can I send a test invite?

Definitely! Just add a second personal email address to the To: or Cc: line and you're in business!

Can I send invites to people who don’t use Office 365?

Yes! You can send a FindTime invite to anyone with an email address. Only organizers are required to be on Office 365.

Skype for Business Broadcast ( Free GoToMeeting Webinar service for 365 Users )

Skype for Business has a limit of 250 Users ... how do big enterprises get around to showing Webinars for a user count larger than this?

Introducing : Skype Meeting Broadcast is a feature of Skype for Business Online and Office 365 that enables you to schedule, produce, and broadcast meetings or events to online audiences up to 10,000 attendees. The Skype Meeting Broadcast portal is where you schedule a meeting of this size.

Company's can use this for free if they have an Office 365 Subscription and send event invitations to internal and external users with automatic Language translation which makes it a great worldwide feature.

A few great use cases for company's

  • For existing Employee's - Great for announcements and feedback across multi region offices and remote users

  • For Existing Customers - Great for new product launches 

  • For New Customers - Great for promoting new products 
  • For the Public - Great for publically listed companies promoted annual meetings

After the meeting, this video can be downloaded to host online in 365 Video for people who missed the event and also a CSV file can be download to list all attendee's to follow up attendee's on future events or feedback

https://www.microsoft.com/itshowcase/Article/Video/598/Overview-of-Skype-Meeting-Broadcast-and-how-to-schedule-a-Skype-Meeting-Broadcast