Microsoft Office 365 provides web, desktop, and mobile apps for outlook, word, excel, powerpoint, onenote, publisher, skype, onedrive, exchange online.
Microsoft Outlook is an personal information manager from microsoft which helps users communicate, manage schedules & find what they need quickly & easily.
Microsoft SharePoint is a web-based collaborative platform which is primarily used for storing and sharing documents, and communicating information across organization.
Plesk is a commercial web hosting and server data center automation software with a control panel developed for Linux and Windows-based retail hosting service providers.