Voted Best Answer
Jun 14, 2017 - 05:22 AM
Great question, but why only have one or the other? For example, we structured our deal in such a way that all of our subscription license types, our Core Infrastructure Suite and the 'bulk' of our estate falls under the EA. I believe you can true down O365 under the EA though, as we have that option next year.
However, we have a number of accounts where O365 doesn't work, and those guys need the Office 2016 Pro Plus with SA model. We put all of those licenses (and a few other adhoc applications) onto our MPSA so we can realise great discounts and we keep the more perpetual licenses away and out of our subscription based EA.
Whilst it may not work for others, it has for us and we've saved quite a bit of money.
With regards to subscription licenses sitting on the shelf during a O365 rollout, that is more than likely going to happen unless you do purchases in bulks of 100, and then transitions in bulks of 100. Not sure that's the most cost or time effective way to do things though, especially when you consider the potential extra work for your project team making the change.