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Since PowerPoint 2007, Microsoft removed the feature that let you compare your presentation with another one -- that was great if you had send your presentation to a colleague and he or she made changes you were not aware of. You can however place both presentations side by side and compare individual slides -- not too great a workaround, but it does allow you to compare the slides.

However that will get you to another roadblock -- viewing more than one PowerPoint presentation at the same time is little difficult because you have to keep switching between windows. However, PowerPoint 2010 does allow you to open more than one PowerPoint presentation side by side -- follow these steps to compare two presentations in PowerPoint 2010:

1. Open two presentations.
   
   
2. Access the View tab of the Ribbon. In the Window group, click the Arrange All button (highlighted in Figure 1).
   
   
   Figure 1: Arrange All lets you view presentations side by side
   
   
3. This will arrange both the presentations in different windows side by side, as shown in Figure 2.
   
   
   Figure 2: Arranged presentations side by side
   
   
4. If you want to copy slides between two presentations, you can change the view on both open presentations to Slide Sorter, as shown in Figure 3.
   
   
   Figure 3: Presentations in Slide Sorter view
   

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