Can I use images from Microsoft Office in my own publications and give them a CC license?

No, this is not permitted.

The images from Microsoft Office programs, including Word, Excel, and PowerPoint, may only be used in these programs. It is, for example, allowed to publish a PowerPoint presentation containing Microsoft images as a PDF.

A PowerPoint presentation containing images from Microsoft Office cannot be granted a CC license because reuse is limited to Microsoft programs. If you still wish to include a CC license, you can indicate that it does not apply to the images.

For more information, see Microsoft Support.