Until MS Office for Mac gets support for Office 2007, I think it will be tricky. PPTM is the file extension for powerpoint presentations with macros, and Keynote does not support macros. Standard pptx files can be opened with Keynote (with some loss of information).
You can also check out the latest versions of OpenOffice and NeoOffice. They may get support for pptm, but I do not think it is there yet.
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how to open .pptm files created by the latest microsoft powerpoint on a mac
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