If I install Ubuntu can I load and use my original Microsoft PowerPoint presentation on the Ubuntu OS and use the slideshow features to give a presentation? Is it also possible to easily convert the Microsoft PowerPoint presentation into the Ubuntu format and present it that way.
The use of Microsoft Power Point presentations is supported by default in Ubuntu. After a fresh installation you will also have Libre Office installed.
This office suite comes with Impress, a presentation software similar to Power Point. With Impress you can not only import and view presentations including slide shows but you will also be able to export your presentations to Power Point format for use in a Windows computer.
Having said that, we need to address possible issues than may arise from converting Power Point to Impress which eventually need some fine tuning after importing:
Therefore, and because we do not really know much on the presentations you have, the best approach is to just try this out. You do not have to install Ubuntu to do this. It is perfectly fine to boot your computer with an Ubuntu CD (or USB).
Instead of installing choose to "Try out Ubuntu".
Your hard drive will not be touched but you will have access to your local hard drives when opening them through the file browser Nautilus (folder icon on the left side launcher).
Your Power Point presentations can then be opened on double click with Impress.
For making presentations LibreOffice Impress works fine including for some Microsoft presentation formats. Impress also works fine for viewing many Microsoft presentation formats including .ppt and .pps, but it does not work for viewing either .pptx or .ppsx formats. To view those formats you need to install Wine from the Ubuntu Software Center and then install the free Microsoft Power Point Viewer application in Wine. Microsoft Power Point Viewer installs easily in Wine and runs without any problems in Ubuntu.