AT&T is a US-based telecoms company, and the second largest provider of mobile services and the largest provider of fixed telephone services in the US.
Microsoft Outlook is an personal information manager from microsoft which helps users communicate, manage schedules & find what they need quickly & easily.
Microsoft Office is a suite of desktop productivity applications and client and server software designed for data analysis, presentations and numeric manipulations.
Microsoft Project helps users plan projects and collaborate from virtually anywhere with the right tools for project managers, project teams, and decision makers.
Microsoft Teams is a chat-based workspace in Office 365 which lets users collaborate on documents, make voice & video conference calls, view chat logs, and more.