Azure ad premium

I have numerous on premise exchange users who are restricted from accessing email on smart devices or outside the office.
I am planning on moving these users to O365 but this obviously creates an issue as they can now access from any where.
I was told ems or perhaps azure ad premium may be a solution but no one could tell me specifically how. I can google but I’m looking for admin experience of someone that has done this. Can it be restricted? Thanks
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Hi. I'm not sure how AD Premium would help. We just recently moved to O365 using the E3 license. We dont have Azure AD premium as we are only using azure AD currently to sync our on prem AD for O365 logins using AD connect on one of our DC's.

With that said, once a user is moved to O365/Exchange online you have several options to restrict how they can access email. I've attached a pic from one of my users.
Abdul AliCommented:
Hi Sid,

You can use Conditional access polices which will restrict the access to email or other Office 365 serivces, based on specific conditions and actions taken, for instance you apply it based on the user location or device state. more info on the below link, however some condtions require Microsoft Intune product licsense to be available or EMS licsense which include intune as well.

Conditional Access In Azure AD

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