https://products.office.com/en-us/business/compare-more-office-365-for-business-plans https://products.office.com/en-us/business/compare-more-offi... Skype for

https://products.office.com/en-us/business/compare-more-office-365-for-business-plans https://products.office.com/en-us/business/compare-more-offi... Skype for Business is available in all Office 365 Business plans except the software-only one (ProPlus). That includes the $5/6 plan (https://products.office.com/en-us/business/office-365-business-essentials https://products.office.com/en-us/business/office-365-busine...) as well as the $8.25/10 plan that includes all of Office. It's not a very good competitor on that front...