: Client machines attempt to "check-in" and renew their activation every 7 days to keep the 180-day timer full. Office 365 vs. Volume Licensing
If you previously downloaded a "Microsoft Office 365 KMS" tool, take these steps immediately: microsoft office 365 kms
(the subscription version) usually activates via the cloud-based Office Licensing Service, requiring a user sign-in and an internet connection every 30 days. However, KMS is the standard for Office LTSC : Client machines attempt to "check-in" and renew