So.... 3 years later -
Is this getting any more traction with anyone's employer organizations?
We retain our usual knee-trembly fears of anything cloud based so although we like the look of yammer for colaboration and sharing of info, we are concerned about user behaviour on it, and also the fact that you need to connect to Azure and could therefore be opening a route into our own network from the cloud.....
I suppose it depends on it's suitability for the use case you have in mind against the local data security legislation.
The thing most talked about for global org's and data security in the cloud is data sovereignty, where the data is stored and who can access it, if data is stored in a country whose local laws give them sovereignty over any data stored in their country then they can gain access to that data.
This is especially interesting for org's wanting to share IP via the cloud.
For all this guff to be truly integrated on MS platforms you'd need to be using Azure AD Pro which has the necessary features to enable hybrid directory features like writeback (that are also required for self service password reset).
Cloud can be great, I've spent a lot of time using Azure in my previous employer over the past couple of years, it's great for global orgs because it allows much easier delivery of content and service geographically closer to the end users, hence improving performance.
With the release of Windows 10 you can also be totally cloud sufficient, this is because Windows 10 devices can be 'joined' to a Azure Domain, in the cloud, removing the need for on-premise domain controller entirely.
Lots of interesting stuff.