I created a standalone PowerApp that points to a SharePoint list. It triggers a flow once the user clicks a button. The flow uses the Populated a Word Template (premium) action, Create a file (OneDrive), Get Items (SharePoint), Send Mail (Office 365). Our company users normally are assigned an Office 365 E3 license but we are thinking of only assigning the specific licenses needed for the users of this app (they will be accessing it from the field via iPad). They do not use any other Office 365 applications.
If we assigned them a SharePoint license plus a Powerapps "per app" license plus Exchange online, would that be enough for them to run the app? Does that make better sense than assigning an Office 365 E3 license plus a PowerApps license?
Yes, that licensing should be sufficient. But I suspect you will find that the combination of a SharePoint license and the Exchange license is more expensive than a regular Office 365 E3. I would stick with the PowerApps perApp license and the Office 365 license. Depending on what they need to do in SharePoint and Exchange you could also look at a lower level license like an F1 instead of the E3.
While and E3 license is sufficient I would suggest looking into an F1 license instead if the user just needs SharePoint + email. Its considerably cheaper. Under both licenses there is no additional cost per user per app so long as the app datasource is SharePoint.
Link to F1 license overview:
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An E1 license is also a possibiity. But as I said that is dependent on what they need to do in SharePoint and Exchange.
Office F1 users can run as many Power Apps as they like using standard connectors. Premium connectors require purchase of either a perApp or standalone perUser license as you mentioned in your question. In terms of Power Apps the main limit on F1 users is that they can consume Power Apps, but they can't make their own Power Apps. The question is more whether the F1 license provides the features you would need for SharePoint and Exchange. Here's a comparison page that will highlight the limitations.
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