Thank you for your question. Skype for Business is part of Microsoft Office 365. You can start to host online meetings and video calls for up to 250 people starting with the Business Premium Plan which is $15.00 per user per month. This option is not available with the Business Plan that is $10.00 per user per month. For more information, you can contact Microsoft directly by clicking here
You may also want to check out our article 6 Best Video Conferencing Software for 2019 for our recommendations.
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