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…


Office 365: Auto-Expanding Archives FAQ

In recent months we’ve been receiving quite a few questions from customers regarding auto-expanding archives. I’d like to clear up some of the misconceptions and answer some of the most frequently asked questions we get on this subject. Think of this as a FAQ on the subject. Before we get going, I strongly advise folks…


A new architecture for Exchange hybrid customers enables Outlook mobile and security

We’re announcing a new architecture for Exchange Server and Office 365 hybrid customers that unlocks Enterprise Mobility + Security (EMS) capabilities for Outlook for iOS and Android. With Hybrid Modern Authentication, Exchange customers can combine the power of Outlook with Azure Conditional Access and Intune App Protection Policies to securely manage corporate messaging on mobile…

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Exchange Server TLS guidance Part 2: Enabling TLS 1.2 and Identifying Clients Not Using It

Overview In part 2 of our Exchange Server TLS Guidance series we focus on enabling and confirming TLS 1.2 can be used by your Exchange Servers for incoming and outgoing connections, as well as identifying any incoming connection which is not utilizing TLS 1.2. The ability to identify these incoming connections will vary by Windows…


Demystifying Hybrid Free/Busy: Finding errors and troubleshooting

In this second part of the Demystifying Hybrid Free/Busy, we will cover troubleshooting of Hybrid Free/Busy scenarios, more specifically – how and where to find an actual error that will indicate where the problem is. Before venturing forth, please make sure that you have seen Part 1 of this demystifying series! Here is the graphics…


An Update on Office 365 Requiring TLS 1.2

Hello Exchange Server followers! In December 2017 it was announced Office 365 planned to discontinue support for TLS 1.0 and TLS 1.1 connections on March 1st, 2018, and after that time only TLS 1.2 connections would be allowed when interacting with Office 365. Many of you have been asking for additional detail on what this…


Demystifying Hybrid Free/Busy: what are the moving parts?

Hybrid Free/Busy is one of those things that many people do not fully understand. If everything works well, the complexity is hidden from view and people working in various parts of organization can seamlessly work together. But if things go wrong… you will appreciate deeper understanding of what makes it work. This is why we…


Exchange Server TLS guidance, part 1: Getting Ready for TLS 1.2

Update: With the Office 365 deadline to have TLS 1.2 enabled being moved from March 2018 to October 2018 we have changed the timing of subsequent post releases; please see below! Overview As the realm of security in technology continues to evolve over time, every so often we say hello to newer and more competent…


Permanently Clear Previous Mailbox Info

We are introducing a new parameter that can be called by using the Set-User cmdlet in Exchange Online PowerShell. The feature is focused for customers doing migration of on-premises mailboxes to the cloud and you will be able to use it within three weeks or so (Edit 1/19: we updated this due to slower than…


Announcing Hybrid Modern Authentication for Exchange On-Premises

We’re very happy to announce support for Hybrid Modern Authentication (HMA) with the next set of cumulative updates (CU) for Exchange 2013 and Exchange 2016, that’s CU8 for Exchange Server 2016, and CU19 for Exchange Server 2013. What is HMA? HMA (not HAM, which Word keeps trying to correct it to for me) provides users…