Can LibreOffice file created on a Mac be viewed and saved by LibreOffice on Windows?

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I would want to make sure you are using fonts that are available on both OSes.

I think it will work fine. It might be a good idea to stick to the open document formats though (.odt for documents, or .odp for slideshows for example). The open document format should be the one that is chosen by default when you save something.