With Skype Meetings, you can quickly set up meetings and share a personalized URL that participants click to join the meeting. During the meeting, participants can IM, share their screen or PowerPoint presentation or use the laser pointer and whiteboard features to make it more engaging and productive. The meeting organizer also gets professional meeting controls such as the ability to mute the audience in order to be heard.
If you don't have Office 365 you can signup for free Skype Meetings at www.skype.com/meetings with a business email address. For the first 60 days you can set up meetings for up to 10 people, after that, meetings are limited to 3 people on the free account.
An Office 365 business subscription gives you the ability to conduct large group meetings for up to 250 people and the ability to IM anyone in your organization at any time.
More details at the link below...