Unfortunately, there is still no functionality to track changes in PowerPoint. You can achieve something similar to what track changes gives you in Word, but you have to manage comments, responses, feedback etc. yourself. Doing it this way allows you to get suggestions for changes from your colleagues, but it is the presentation owner who actually makes the changes.
A good way to capture feedback is to get your colleagues to use the comments feature in PowerPoint. Comments in PowerPoint 2013 are much improved and can initiate useful discussions about the presentation being viewed. Each comment is tagged with the name of the user who made it, so you know who thinks what.
You could email everyone in your team a copy of the presentation. However, if you do this, you will receive multiple copies back from them, all with different comments. Compiling all comments into one “master” presentation would be a nightmare. A better solution is to store the presentation in one central location and invite all contributors to comment on it. Microsoft SkyDrive is a good location to store a presentation that you want to share.
To make this work, it’s a good idea to save the original presentation somewhere on your computer. Then you will always have the original to refer to. Next, post a second copy to SkyDrive and ask your colleagues to provide feedback by leaving comments in it. You can email them with a link to the shared presentation so they know where it is. You may need to give permissions to your reviewers so they can access your presentation.
Once the feedback process is complete, it’s sometimes useful to remove permissions from the shared presentation. Doing so will stop further comments being left that you might miss.
Open both the original and the shared presentation and work through all the comments left in the shared version. The Review tab is where you need to go to view comments. Use the Next and Previous buttons in the Comments group to navigate them.
Each comment is marked by a speech bubble that looks like this:
If you read a comments that you agree with, you can make appropriate changes to your original presentation, saving the file after each one.