Office 365 activation

[Interorient]

Good day,

We have problem with Office 365 activation. We whitelisted required DNS name as per microsoft but can't activate it still. If we provide full access over 443 port then Office is activating, we remove full access and Outlook is working fine with our whitelist. 

How can we adjust firewall for Office 365 activation as well?

[Toshi_Esumi]

Did you try Internet Service database "Microsoft-Office365" as an address object? It's supposed to include all IPs related to Office365. I haven't tested myself but so far I haven't heard back from anybody I recommended this.