Correcting Shared Mailbox provisioning and sizing

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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Announcing the support for modern public folder migrations without dumpster data

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…


Hybrid Organization Configuration Transfer

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…


Sender Rewriting Scheme (SRS) coming to Office 365

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…


Best practices for using assigned Office 365 DNS records

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…


Mail flow insights are available in Security & Compliance center

Update 6/22/18: for more updates on the subject, please see this post. We’re excited to announce that Mail flow Insights will soon be available in the Office 365 Security & Compliance Center. We’ll continue to create and refine mail flow insights to help improve productivity for admins, and we’ll announce them as they become available….


New Message Trace in Office 365 Security & Compliance Center

Overview Message Trace is a key tool for email admins to troubleshoot and track the health of their organization’s mail flow. Message Trace in the Exchange Admin Center (EAC) is a useful tool for tracing messages, but it’s visually cluttered and confusing, and it lacks a number of more sophisticated capabilities. To make Message Trace…


New date for discontinuation of support for Session Border Controllers in Exchange Online Unified Messaging

Update 9/12/2018: We have two important updates for customers: As we prepare to discontinue support for PBX’s connecting to Exchange Online Unified Messaging, we will remove the ability for tenant admins to configure new PBX connections on or after October 8, 2018. Existing connections will not be impacted by this change. Based on customer feedback,…


Announcing the increase of the Public Folder limit in Exchange Online from 250,000 to 500,000 folders

Last September, we officially announced the increase of the supported limit of Public Folders in Exchange Online from 100,000 to 250,000. In line with our efforts to scale Public Folders even further, we are glad to announce that Exchange Online now officially supports public folder hierarchies of up to 500K public folders in the cloud…


Changes coming to the SMTP Authenticated Submission client protocol

There are a number of client protocols offered by Exchange Online to allow email clients to send email from their mailboxes. One of the most widespread protocols is SMTP Authenticated Submission (also known as SMTP Client Submission) which is supported by most email service providers. This non-proprietary protocol is used to send email by legacy…