I hope this helps:
Years ago, I came up with the definition that Content Strategy
is getting the right content to the right user at the right time. The
concept of right content to the right user/person at the right time, was
not my idea. It hailed from the marketing world, and as Joe Pulizzi
correctly has pointed out, it comes from Don Peppers and Martha Rogers
seminal work: "The One to One Future: Building Relationships One
Customer at a Time." But I re-purposed that concept for content
strategy, as I thought it a perfect definition because it implies not
only the right content (which means to the right devices, for the right
purposes, etc) but also the 'getting' which implies the delivery and the
enforcement of rules necessary to necessitate that. Years ago, I took
the definition to Sapient and my team there helped evolve that concept by
stating, it breaks into three buckets: content experience, content
delivery and content governance. Again, others in the industry were
using similar concepts, these were how conceptualized those things. Thus,
anything that fit within the overarching mandate of getting the right
content to the right user at the right time, which included the content
experience, the delivery of it, and the governance of its quality and
sustainability, were aspects of content strategy. Of course, we
approached it at the enterprise level. I point out this history, because
I think a lot of discussion around communications strategy and content
marketing strategy should realize that these really do live within a
larger framework of enterprise content strategy. Now that is not to say
that everyone will position it that way, but in my opinion, it is the
correct way to frame it. Thus, communications strategy is not the same
as content strategy, and is more specific, as it pertains specifically
to thinking about the messages delivered to the end user. (E.g., content
experience). Rahel, is correct in my opinion, that content strategy is
so much more than that (which is not to belittle communications
strategy).
By the way, Anne Casson and I discuss in detail the differences between content marketing and content strategy on my youtube channel. I would say the same precepts apply to content strategy versus communications strategy.
Kevin