Block Outlook.com but not affect O365

Hi M8ey 

Unfortunately this may be a hit and miss rule to create.

Microsoft does a lot of lookups to live.com and outlook.com.  However I have seen that for clients on Office365, it appears that the URLs all end with office365.com.

As stated above, this will be trial and error.

You could create a rule at the very top and have Microsoft's IPs/FQDNs for Office365 and allow the traffic.  Then create a second rule below that, that then blocks traffic to web email categories.

To ensure you dont affect your entire user base, you can add source IPs for testing purposes before rolling it out to everyone.

This KBA will help: https://community.sophos.com/kb/en-us/127270 and this 1: https://community.sophos.com/kb/en-us/126532

Here is a Microsoft KB article that details all the FQDNs and IPs.  However I do see a FQDN for outlook.com. - https://docs.microsoft.com/en-us/office365/enterprise/urls-and-ip-address-ranges

Thanks!

KingChris said:

Unfortunately this may be a hit and miss rule to create.

Yeah I agree - for now leaving it to "outlook.live.com" seems to be working. I will await the screams from the staff if it breaks stuff :-)

KingChris said:

Unfortunately this may be a hit and miss rule to create.

Yeah I agree - for now leaving it to "outlook.live.com" seems to be working. I will await the screams from the staff if it breaks stuff :-)