office 365 group expiration
Within the Office 365 Group Expiration setup there should be a way to set it such that all groups except specific ones are subject to the expiration setting. As it stands now it's the other way around; all groups or only the selected ones. In an environment where users are permitted to created their own groups (something I was told even Microsoft allows) you really need the expiration feature enabled by default. But there are certainly use cases where as an admin you will want specific groups exempted from this setting.
Chris Beattie commented
Just flagged this with Microsoft support and they said it's not possible and asked me to post here. It's crazy this isn't a feature when they're actively encouraging organisations to migrate from distribution groups to O365 groups. We did that and then a short time later realised that the new groups are being expired since at the minute they're just used for email. Given that many of these are public-facing and critically important, that's a very bad thing!