Your company has a Microsoft Office 365 subscription. You need to co-author files with other users. Which tool should you use?

Microsoft SharePoint Online hosts document libraries where Office files (Word, Excel, PowerPoint) can be stored and opened by multiple users simultaneously for real-time co-authoring. SharePoint Online integrates with Office 365 apps to track changes, show presence indicators, and sync edits across all co-authors without file locking conflicts.

Microsoft Skype for Business Online is a unified communications platform for instant messaging, voice, and video calls - it does not provide document storage or co-authoring capabilities.

Microsoft Office Delve is a discovery tool that surfaces relevant content and insights based on user activity across Office 365, but it does not enable document editing or co-authoring.

Microsoft Exchange Online is an email and calendaring service; while it allows sharing attachments, it does not provide a collaborative document editing environment for co-authoring.