Thank you for your inquiry. Skype for Business is included with an Office 365 business package. There are three business packages for Office 365: Business Essentials, Business, and Business Premium. The Business Essentials package is $6 per month per user. The Business package is $10 per month per user. The Business Premium package is $15 per month per user.
If you need to reach Skype to discuss Skype for Business, you can visit https://support.microsoft.com/en-us/contactus/
If you are interested in our recommendations for webinar software options, please check out https://fitsmallbusiness.com/best-webinar-software/
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