Block Outlook clients when accesing O365 externally

Hi,

We are migrating from Exchange to O365, we are also using ADFS 3.0.

I have been asked to prevent Outlook 2010 and 2016 clients from accessing mail when off the corporate network. Users must be able to still access their email externally via Office.com and via Active Sync for BB.

I'm not sure where to start and have to produce a matrix of what is achievable without Conditional Access as we do not have licenses.

Thanks
RSMGmailAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Shreedhar EtteCommented:
Vasil Michev (MVP)Commented:
In addition to the method outlined above, there is a new feature in Exchange Online that might help you with the request, namely Client Access Rules: https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/client-access-rules/client-access-rules
RSMGmailAuthor Commented:
Thanks for your quick responses,
Can you confirm that this will work on Outlook 2010 and Outlook 2016 clients?
Also should Modern Auth be enabeled or disabled?

Thanks
Vasil Michev (MVP)Commented:
That's up to you, depending on which auth type you are using the steps to configure AD FS claims rules will differ though. Client Access Rules apply to all Outlook versions/auth methods.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.