Introducing the Exchange Online Fiddler Extension

Working in support at Microsoft, you get to deal with a lot of organizations who are migrating to Exchange Online. This type of migration dramatically changes how web traffic flows in the organization as the traffic moves away from Exchange on the Local Area Network to servers hosted by Microsoft in a Microsoft Data Center,…


Announcing Support for Controlled Connections to Public Folders in Outlook

Up to now, Administrators did not have control over which users would see public folders in their Outlook clients. If public folders were created within the organization or if an Exchange Online organization is configured to access on-premises public folders, all clients would make a connection to and show the “Public folders” object in Outlook….


MS11-025 required on Exchange Server versions released before October 2018

In the security advisories released on 10/09/2018, CVE-2010-3190 was updated to apply to Exchange Server. This bulletin now applies to all versions and cumulative updates for Exchange Server released prior to October 2018. The Exchange team is aware that the installation program for Exchange Server is applying an unpatched version of a Visual Studio released…


Deploy Exchange Server 2019 on Windows Server Core

Hurrah! If you have not yet heard: Exchange Server 2019 Public preview was announced earlier, and it is the first version of Exchange that you can install on Server Core! Now, while that’s great news, if you haven’t worked on Server Core, there may be bit of a learning curve. The purpose of this post…


Resource Based Throttling and Prioritization in Exchange Online Migrations

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:\>…


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…


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…


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…


Exchange Server TLS guidance Part 3: Turning Off TLS 1.0/1.1

Overview In part 3 of our Exchange Server TLS Guidance series, we introduce how to turn off TLS 1.0 and 1.1 in your Exchange Server deployment. Turning off TLS 1.0 and 1.1 can be a highly disruptive event if not planned and executed properly. The Exchange team believes that it is time for the ecosystem…


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…