Office 365 and block Outlook App

We have users that we don't want to be able to view email outside of normal working hours.  We also only want these users to view their email from their work computer and not from their phone.  We are running Office 365 with no AD sync.  

We've been running tests to try to block access to the various ways people can check their emails outside of work.  The only one that we are struggling with is the Outlook APP for mobile users.  

How do you block this APP from downloading email while still allowing the user to receive email from their work computer?

Thanks for any help.
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Rob KnightConsultantCommented:
Have you considered conditional access as you may already have this in your subscription?
Vasil Michev (MVP)Commented:
You can block the app by setting up an ActiveSync Device Access Rule rule based on the "Outlook for iOS and Android" DeviceModel string or "Outlook" as DeviceType. Here's an example article:

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cames01Author Commented:
Vasil - This might be the answer.  I just looked at it in the admin center.  So, if we set this to quarantine we can accept users that we want to have access to the APP while blocking everybody else?
Vasil Michev (MVP)Commented:
Yes, but that will require manual intervention - if you are OK with it.
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