Once you look for temporary potential ambiguity, you'll find it everywhere
The Microsoft Manual of Style tells us not to use once as a subordinator because it could lead to ambiguity. Specifically, from the 1995 edition:
once
To avoid ambiguity, do not use as a synonym for after.Correct
After you save the document, you can quit the program.Incorrect
Once you save the document, you can quit the program.
(That's the entire entry.) Ambiguity? Stop a moment and try to concoct an English sentence where subordinator once could be taken to be something else. It can be done — see below — but it's not easy, and I doubt that examples like the ones below were what the MMoS folks had in mind.
Instead, I think they were concerned about the fact that once has three primary uses and that readers (especially readers who are not native speakers of English) might not understand which one was intended until partway into the sentence: TEMPORARY POTENTIAL AMBIGUITY (TPA). (I'll take up the concern for non-native speakers in a later posting.)
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