Understanding the precedence of Retention policy with Security&Compliance center and the other O365 applications

https://support.office.com/en-us/article/overview-of-retention-policies-5e377752-700d-4870-9b6d-12bfc12d2423#principles

Office 365 groups retention and expiration:

retention policy define with Security&Compliance wins

After expiration (inactivity days), the o365 group will be soft deleted and can be recovered in the next 30 days, except if a retention policy is greater. The owner(s) will be informed 30 days,15 days,1 day before group expiration.

https://www.petri.com/better-office-365-group-expiration

https://docs.microsoft.com/en-us/azure/active-directory/active-directory-groups-lifecycle-azure-portal

 

Onedrive data deletion and retention:

by default 30 days

https://support.microsoft.com/en-us/help/3042522/onedrive-for-business-retention-and-deletion

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