Forum Discussion
Exchange Online Restricts the Number of Dynamic Distribution Groups
Exchange Online is imposing a new tenant-wide limit of 3,000 Dynamic Distribution Groups. Few tenants might be affected, but the question might be asked why Microsoft is limiting DDGs at this point. ...
Interesting and disappointing in equal measure. Reminds me of when they dialled back the frequency at which dynamic group memberships were reassessed.
Your idea that it's a precursor to perhaps standardising on Azure dynamic groups for everything does make sense given the previous limit for the Azure dynamic groups was bumped up from 5,000 to 15,000 relatively recently.
But the big, fat caveat is that the Azure dynamic groups have much more than a single application to cover and also includes covering administrative units (i.e. [dynamic group] + [administrative units] must be <= 15,000). Additionally, devices also fall into scope (for Intune) usage-wise.
Granted, 15,000 is more than I can see being used by small-to-medium organisations, but once you get into large government and multinationals, I can't help but immediately reflect on how well the hard-coded limit of 999 global catalog servers went in Windows 2000 (i.e. We've see this all before).
See how it plays out, I guess.
Cheers,
Lain
