Exchange Online Conditional Access

[Westbrook215]

Can exchange online limit access in these scenarios:

1 - limit access for outlook clients to come from corporate IP?

2 - limit access for activesync clients with approved devices (unapproved devices stay in quarantine until approved by an admin)

3 - disable webmail for every mailbox?

[#2]

1) Use CA policies if you have Azure AD Premium or client access rules if you dont: https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/client-access-rules/...
2) The built-in AS controls allow that, so does Office 365 MRM or Intune, the latter of course offering a lot more options that the former two
3) Set-CASMailbox is your friend.