Word is a bit more tolerable if people do the following:
1. Use styles.
Seriously - don't just select 'Bold' for your headings. This goes for paragraphs as well. Create styles and use those.If you want to include text in a different font (eg; italics for quotes or fixed font for some source) create a style. Don't just rely on 'Normal'. Create a style for the text under each heading (Heading 1, Body 1, Heading 2, Body 2, Source 2 etc.).
It makes Word happier (probably because it reduces the mark-up it needs so documents are less fragile) and makes a lot of document-wide operations more sane (like disabling spell checking and auto formatting for source code paragraphs). If a document has multiple contributors it encourages conformity.
2. Never (ever. Seriously)
Edit or define hierarchically numbered heading styles. Life is too short. Your co-workers might tolerate some occasional profanity but no-one should be expected to put up with the torrent of abuse that you will unleash if you start messing with these styles.