Office 365: Challenges with Distribution Groups for Migrated Mailboxes and a Script Based Solution

=========================================================================================== Group Migration Script v1.0 –> https://github.com/timmcmic/DLConversion/blob/master/src/DLConversion.ps1 =========================================================================================== Distribution groups are an excellent way to organize multiple recipients under a single address.  Like Exchange Server on-premises, Office 365 supports mail-enabled distribution groups, security groups, and dynamic distribution groups.  When Active Directory and Exchange are used on-premises, distribution groups are typically created in the on-premises Active…

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Office 365: Stale Information in the Offline Address Book and Individual Contact Cards

In Office 365 an Exchange related object can be replicated from the on premises Active Directory to Azure Active Directory and then forward synchronized into the Exchange Online Active Directory.  In most cases the objects synchronized into the Exchange Online Active Directory represent mail enabled objects.  User accounts are unique in that they are replicated…

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Office 365: A different approach to handling Office 365 group mail flow…

In Exchange Online an Office 365 Group ( Unified Group / Modern Group ) allows for a new level of team collaboration.  Office 365 Groups are created directly in Exchange Online and Azure Active Directory.  This makes them cloud only objects.  The membership and attributes of these objects are maintained directly in Office 365. There…

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Office 365: Unable to modify group membership in the Office 365 portal…

In Office 365 cloud only groups can have their membership managed through the Office 365 portal or through the Azure Active Directory powershell commands.  As with on premises Active Directory multiple group types can be created and managed.  You can also create direct user membership in groups as well as nested group membership.  I recently…

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Office 365: Correcting users who have had a mailbox in the cloud and on-premises…

In some previous blog posts I have outlined conditions where users may have inadvertently had a mailbox both on premises and in the cloud at the same time.  The following links outline these scenarios and how to attempt to proactively identity users that may fall in this condition. https://blogs.technet.microsoft.com/timmcmic/2018/04/10/office-365-detecting-and-preventing-duplicate-mailboxes-between-on-premises-and-exchange-online/ https://blogs.technet.microsoft.com/timmcmic/2017/09/10/office-365-users-have-both-a-cloud-and-on-premises-mailbox/ https://blogs.technet.microsoft.com/timmcmic/2018/04/09/office-365-licensing-mail-users-results-in-mailbox-objects/ With an understanding of…

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Office 365: Exchange Migrations and the data migrated information…

In Office 365 migration batches are the preferred method of establishing mailbox migrations to Office 365.  When a migration batch is established the users included in the batch are represented as migration users within the service.  Within the context of each migration user is where we track the migration process.  One of the data points…

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Office 365: The mystery of mobile phone…

In the last few weeks I have worked several escalations from customers inquiring about inconsistencies with the mobile phone attribute.  In almost all cases inconsistencies were noticed in the Exchange Online contact card where mobile phone listed did not match on premises. When directory synchronization is enabled on an Office 365 tenant a set of…

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Office 365: Unable to locate an Azure Active Directory user for an Exchange Online Mailbox

In order for an Exchange Online mailbox to exist in Office 365 it must be attached to an Azure Active Directory object.  In Exchange Online we record the object ID for the Azure Active Directory account as the external directory object id of the mailbox. PS C:\> Get-Mailbox tmcmichael | fl name,externalDirectoryObjectID Name                      : Timothy…

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Office 365: Mail disable an on premises security group…

Administrators may enable security groups on premises as distribution groups.  [PS] C:\>Get-DistributionGroup BlogSecurityGroup Name              DisplayName       GroupType                  PrimarySmtpAddress —-              ———–       ———                  —————— BlogSecurityGroup BlogSecurityGroup Universal, SecurityEnabled BlogSecurityGroup@domain.org Azure Active Directory Connect will provision these groups and they will appear as mail enabled objects in Exchange Online. PS C:\> Get-DistributionGroup BlogSecurityGroup Name              DisplayName       GroupType                  PrimarySmtpAddress —-              ———–      …

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Office 365: Resetting a migrated users Azure Active Directory account….

In certain support circumstances it may become necessary to hard delete an Azure Active Directory account.  When the user has a mailbox that has been migrated to Exchange Online additional steps may be required to restore mailbox access. It is important to note that hard deleting an account should not be a common place operation. …

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