Powerpoint

Hello Jo

Thank you for your question.

Mac and Windows are two different operating systems, designed to run on two different platforms; therefore files created on one don't necessarily display very well when viewed on the other.

If you are using a Mac, then here is a link to best practices for trying to ensure that files you create are compatible as possible with Windows (sorry it's a long horrible looking link):
http://www.microsoft.com/mac/itpros/default.mspx?clr=99-15-0& ;srcid=f4a50b3a-eedc-456a-8c8b-b6b71aa646b41033&ep=9&target=7acce321-36fb-48d6-8c76-12cb3a0063ee1033

Kind regards
Amanda