Office 365: DNS health checks and the Office 365 Portal

In recent weeks I have worked on several escalations regarding the DNS health checks in the Office 365 portal.  In August I published some guidance on how to review and handle these errors.  That article has since been updated to reflect new information and new portal behavior.  Please check out https://blogs.technet.microsoft.com/timmcmic/2017/08/15/dns-errors-and-warnings-in-the-office-365-portal/ for updated information.

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Office 365: Who can receive the weekly digest email…

In Office 365 we provide administrators the ability to access important information about the service via the message center.  At https://portal.office.com on the main administration page the message center option appears in the center view.     When selecting the message center option the administrator is presented with a list of notifications, announcements, and other…

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Exchange, Cluster, and Network Thresholds

Cluster failures due to transient cluster communications problems can often lead to databases failing over between nodes or nodes being removed from cluster membership.  For many administrators the occasional network hiccups that can drive up the likely hood of this occurring is a fact of life.  It is definitely more prevalent when cluster nodes are…

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Office 365: Upgrading legacy distribution lists to Office 365 Groups

Office 365 groups are the recommended replacement for legacy distribution groups in Office 365.  You can learn more about Office 365 groups at the following link:  https://support.office.com/en-us/article/Learn-about-Office-365-Groups-b565caa1-5c40-40ef-9915-60fdb2d97fa2   In an effort to assist in the adoption of Office 365 groups we now offer administrators the opportunity to upgrade legacy groups to Office 365 groups.  The…

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Office 365: Disabling password synchronization and password remnants…

A feature of directory synchronization (Azure AD Connect) is the ability to synchronize on premises Active Directory passwords to Azure Active Directory for the purposes of signing on using a single password.  The use of the on premises password is only valid when the domain you are authenticating to is not federated.  There are also…

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Office 365: Converting a remote mailbox to a mail user…

In Office 365 it may become necessary to change recipient types for on premises accounts.  In this scenario contoso.com provided a mailbox within their Office 365 tenant for a user.  A decision was made to host the users mailbox within a different mail system but authentication would still occur against the contoso.com domain.  The desire…

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Office 365: Fatal error RecipientNotFoundPermanentException has occurred

In Office 365 administrators may experience almost immediate failures of migrations to Office 365.  The error is typically in the following format:   Error: Cannot find a recipient that has mailbox GUID ‘MAILBOX-GUID’.   The migration log shows the following information at the end of the log regarding the failure exception””:   9/11/2017 9:13:58 PM…

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Office 365: Users have both a cloud and on premises mailbox.

In Office 365 our provisioning logic generally prevents the existence of a mailbox on premises and in the service.  You can imagine the confusion of cloud messages delivering to a mailbox in the cloud and on premises messages delivering to a mailbox on premises.   When a mailbox is provisioned on premises the azure active…

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Handling Migrations – StalledDueToTarget_MdbFull or TargetDatabaseFullPermanentException

When an administrator provisions a migration batch to Office 365 and adds users, objects known as migration users are created, which you can view using Get-MigrationUser. When migration users and the corresponding move requests (Get-MoveRequest) are created an Exchange Online mailbox database is assigned to each mailbox that will be migrated.  Exchange Online uses an…

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DNS Errors and Warnings in the Office 365 Portal

  The Office 365 portal often offers information regarding the status and health of your services.    The DNS checks are not performed on each administrator logon to the portal.  The checks are performed by our Azure DNS infrastructure determining the Source of Authority (SOA) records for the registered domains.  This will return the list…

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