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The Microsoft Exchange Team Blog
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    As someone who reads through hundreds of support cases each month, nothing pains me more than seeing customers struggling with seemingly complex issues, only to discover that the root cause is quite simple. Never is this truer than it is with DNS. Some of the most complicated security and lost mail issues boil down to...

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    The introduction of email authentication mechanisms like SPF, DKIM, and DMARC have improved email security and spoofing prevention. However, some scenarios have been disrupted by these authentication mechanisms, namely auto-forwarding and relaying. Here in Office 365, we are committed to ensuring the security of our customers and the general integrity of the email ecosystem that...

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    We are very happy to announce a new feature that will help you the admin reduce the amount of time needed to configure config objects once hybrid setup is complete. What does this feature do? This feature enables a one-time transfer of key organization policy objects during the onboarding process from Exchange on-premises to Exchange...

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    The latest cumulative updates for Exchange Server 2016 and Exchange Server 2013 are now available on the download center. An update rollup for Exchange Server 2010 is also available. The updates released today include important changes to the pre-requisites required to install Exchange Server. The installation packages include fixes to customer reported issues, all previously...

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    Long time Exchange administrators will remember that Exchange Server had a feature that was for a while unceremoniously referred to as the “dumpster”. We have since renamed the feature to a more descriptive Recoverable Items Folder. This blog post also contains a bit of history of this feature for those interested. Up to now, during...

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    We are correcting how shared (and resource) mailboxes are created in Exchange Online. As per our documentation (here and here), shared and resource mailboxes in Exchange Online should be created with the size of 50GB and if a larger size is desired, a license should be assigned to the mailbox. For some time now, though,...

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  • 06/22/18--09:58: Update on mail flow insights
  • Last month, we announced the release of mail flow insights in the Office 365 Security & Compliance Center in this blog post. We're making changes to the mail flow insights dashboard to make it more intuitive. These changes are currently in deployment, and will be available in the week of June 25, 2018. We've changed...

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    We often get questions about throttling in Mailbox Replication Service (MRS) based migrations in Exchange online. When migrating, you may see messages such as StalledDueTo_TargetDiskLatency for some periods of time. These messages come from our resource-based throttling infrastructure in Exchange Online. This is how this would look like in the output of Get-MoveRequestStatistics: PS C:\>...

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    Over the last few years, we have been investing in services that help developers access information in Office 365 in a simple and intuitive way, specifically through Microsoft Graph.  Microsoft Graph and the use of OAuth 2.0 provide increased security and seamless integration with other Microsoft cloud services and is rapidly expanding developer access to...

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    The Exchange team is aware of issues with the Windows Operating System updates published July 10th, 2018 causing Exchange to not function correctly. The Windows servicing team has advised us that they will be releasing updates to the affected packages. We encourage Exchange customers to delay applying the July 10th updates, including the security updates...