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Mike McLean (OFFICE)'s avatar
Mike McLean (OFFICE)
Icon for Microsoft rankMicrosoft
Aug 17, 2017

Office 365 Groups will now have unique mailNickname

Hi all,   We've completed an enhancement with the Azure Active Directory team which will now enforce mailNickname to be unique across all Office 365 Groups within a tenant. This will help ensure ...
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office 365
Office 365 Groups
Mike McLean (OFFICE)'s avatar
Mike McLean (OFFICE)
Icon for Microsoft rankMicrosoft
Aug 22, 2017

This is a great observation. For this first step, we're mainly focusing on enforcing uniqueness across cloud-managed Office 365 Groups. One approach we've seen customers use is to build a universal Alias Reservation List that guarantees uniqueness across all their services that create mail-enabled properties, including on-premises.

TonyRedmond's avatar
TonyRedmond
MVP
Aug 22, 2017

I really don't think you need anything more complicated than to check all mail-enabled objects (rather than just Groups as you do today) to detect duplicate aliases...

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