Productivity & Collaboration Suites bundle email, calendaring, document editing, file storage, chat, video meetings, and an identity directory into a single integrated platform administered as one tenant. Core capabilities include inbox and calendar, document suite (word processor, spreadsheet, presentation), cloud file storage with sharing and permissions, messaging and team chat, video conferencing, and tenant-wide administration covering identity, licensing, DLP, and retention policies. The category is effectively a duopoly with a handful of regional providers serving specific segments.