The archaic 'two spaces' after sentences rule belongs to the days of typewriters and fixed-width fonts. It has no place in documents using proportional fonts and/or justification.

Moreover, the process discussed above doesn't limit itself to periods at the end of sentences - it also affects every abbreviation that ends with a period. Far simpler is the deletion of those quite unnecessary spaces.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Quite so! How to apply them consistently may be an interesting brain-teaser, but shouldn't really be a "need to fix this" question these days.