Microsoft 365 Business is Microsoft's office and collaboration suite for small and medium businesses with up to 300 employees, integrating desktop Office, Exchange business email, Teams, OneDrive and SharePoint, with over 345 million monthly active users worldwide.
Microsoft 365 is Microsoft's enterprise productivity cloud suite with over 345 million monthly active users, covering Word, Excel, Teams, OneDrive, Exchange, and SharePoint as the industry standard for enterprise office and collaboration.
Skype is a VoIP pioneer founded in Luxembourg in 2003 and acquired by Microsoft for USD 8.5 billion in 2011, offering free audio/video calls and low-cost international calling, now being replaced by Microsoft Teams.