PowerPoint Collaboration & Comments
When a presentation is saved to OneDrive or SharePoint, multiple users can open and edit it at the same time. PowerPoint synchronises changes automatically every few seconds. Each collaborator's cursor and selection appear on the slide in a different colour, labelled with their name — you see exactly which slide they are on and which object they have selected.
Think of it as Google Docs for presentations. Changes from all editors merge automatically. If two people edit the same text box simultaneously, PowerPoint detects the conflict and prompts the second editor to accept or decline the merge. In practice, teams avoid conflicts by working on different slides concurrently — the left panel clearly shows which slides others are actively editing through small avatar indicators.
Adding Comments
Select any object or click anywhere on the slide. Click Review → New Comment or press Ctrl + Alt + M. A comment panel opens on the right side. Type your feedback. The comment anchors to the selected object or the clicked position — a small speech-bubble icon marks the location on the slide. Comments do not appear during the presentation; they exist only in editing mode.
Threaded Replies
Other collaborators can reply directly to an existing comment, creating a threaded conversation attached to that specific slide element. This threading keeps feedback organised — all discussion about a particular chart stays in the chart's comment thread rather than scattered across a separate email chain or chat.
Reviewing and Resolving Comments
Click Review → Show Comments to open the Comments panel listing all comments across all slides chronologically. Navigate between comments using Review → Previous and Next buttons. Once feedback has been addressed, right-click a comment and choose Resolve Comment — the comment collapses but remains visible in a resolved state. Resolved comments can be reopened if the issue resurfaces. Delete a comment entirely with Delete Comment when the discussion is permanently closed.
Type @ followed by a collaborator's name inside a comment to send them an email notification containing the comment text and a direct link to the slide. This ensures reviewers see specific feedback immediately without checking the file manually.
Tracking Changes with Version History
OneDrive automatically saves a version of the file after every significant editing session. Click File → Info → Version History to see a timeline of saved versions with timestamps and the name of the last editor. Open any version in read-only mode to compare it with the current file. Restore a previous version by opening it and saving a copy, or by clicking Restore — which replaces the current file with the selected version.
Restricting Editing
Click Review → Protect Presentation → Mark as Final to set the file to read-only and discourage further editing. This does not encrypt the file — recipients can still enable editing by clicking a prompt in the yellow notification bar. For stronger protection, use File → Info → Protect Presentation → Encrypt with Password to require a password for opening, or Restrict Access (requires Microsoft Information Rights Management) to prevent printing, forwarding, or copying content.
Teams without OneDrive can still collaborate sequentially — one person edits, saves, and emails the file; the next person opens it, makes changes, and sends it back. The Comments system works identically in this workflow. However, merging changes from two simultaneously edited copies requires manual comparison — the co-authoring experience disappears without a shared cloud location.