@Greg Manners:
- Exchange 2010 content is published in a single branch - 141. Generally, service pack content is not published separately, although there may be specific topics in the content that address new services packs - for example, topics like What's New in Exchange
2010 SP2.

- Exchange 2010 content is published in EXCHG.150
- Going forward, this should become less relevant because you won't be seeing versionless URLs. I posted the suggestion to add (EXCHG.141) or (EXCHG.150) to help customers discover content during the switchover (when some customers reported that the
Other Versions control was not available on each page, or when they encountered a "Page not found" error for a topic). It's much easier to use the
Other Versions control on each page.
Thanks for the suggestion to use major Exchange versions (2010, 2013) in the URL instead of 141, 150 - passing it on the team for consideration.