How To: Exchange Authentication Policies

There are several ways how you can protect and limit access to Exchange Online. Conditional Access, Client Access Rules, the older ActiveSync Device rules and, the topic of this post, Authentication Policies. These policies are available in Exchange Online and Exchange Server 2019 since CU2. This article will show you how to implement this. Why … Continue reading "How To: Exchange Authentication Policies"

Valimail Monitor for Office 365: Your Free DMARC Reporting Tool

On their security blog on the 3rd of June 2019, Microsoft announced that Valimail Monitor for Office 365 is available. This option enables organizations using Exchange Online from Office 365 for their company mail to leverage DMARC. The Road to securing E-Mail Cyberattacks are common these days. These attacks can be actively targeting your organization … Continue reading "Valimail Monitor for Office 365: Your Free DMARC Reporting Tool"

Exchange migration “Couldn’t switch the mailbox into Sync Source mode”

The issue During one of my Exchange Online migration projects I encountered the following error on several mailboxes: "Message : Error: Couldn’t switch the mailbox into Sync Source mode. This could be because of one of the following reasons: Another administrator is currently moving the mailbox. The mailbox is locked. The Microsoft Exchange Mailbox Replication … Continue reading "Exchange migration “Couldn’t switch the mailbox into Sync Source mode”"

TOOL: My own Exchange Move Request Report script

As a consultant I do a lot of migrations or assist in them. In this case I wrote my own script for processing the information generated by the Mailbox Replication Service. This service is used in Microsoft Exchange on-premises and in the cloud for migrating the mailboxes between databases or environments. After multiple times doing … Continue reading "TOOL: My own Exchange Move Request Report script"

The mysterious case of a failed account recovery and orphaned mailbox

In this blogpost I want to address two real-life cases that I encountered in the same Microsoft Office 365 tenant. The reason why I address the two issues in this one blog is because the errors and steps to resolution, were identical for both issues. Background Information The issues occurred in a cloud-only tenant. The … Continue reading "The mysterious case of a failed account recovery and orphaned mailbox"

Exchange Server 2019 Preview is available!

Today the Microsoft Exchange Product Group announced the release of the Exchange Server 2019 public preview! They also lifted the veil on some of the new features/capabilities etc. of this new major build of Exchange Server. Where can I download the Preview bits? Click here to download Exchange Server 2019 Preview. Warning: These are Preview … Continue reading "Exchange Server 2019 Preview is available!"

I will be speaking at ExpertsLive NL 2018!

And some other news dropped in my mailbox this week: I will be speaking together with Jetze Mellema at ExpertsLive NL 2018 on 19th June! During that session we will talk about Exchange migrations; "Destination unknown, migrating mailboxes from somewhere to anywhere". What will we be speaking about exactly? “Migrating mailboxes. Something every Exchange admin … Continue reading "I will be speaking at ExpertsLive NL 2018!"

Free community event in Maarssen (NL) this Thursday evening

What? A free community event in a first collaboration between Dutch and Belgian Exchange, Skype and Office 365 experts. There will be two sessions, but before and after sessions you are free to talk with any of them about Exchange, Skype for Business/Teams and Office 365. When? This Thursday evening starting at 18:00. Where? Maarssen … Continue reading "Free community event in Maarssen (NL) this Thursday evening"

Office 365 to enforce TLS 1.2 per October 15, 2020

Update 21 July 2020 Microsoft has set a new date for the deprecation of TLS1.0 and 1.1, after a previous postponement due to the pandemic. You can find it in the Microsoft 365 Message Center message MC218794, which also references this Docs article. From October 15, 2020 onward, Microsoft will gradually enforce TLS1.2 on Office … Continue reading "Office 365 to enforce TLS 1.2 per October 15, 2020"

I'll be speaking at E-Communications & Collaboration Day 2017 (BE-COM.eu) on May 3rd 2017

In a few weeks, I’ll be travelling to Novotel Leuven in my neighboring country Belgium for the E-Communications & Collaboration Day 2017, a full-day (May 3rd 2017) of expert presentations and content about Office 365, Exchange, Skype for Business and related technologies. During this day, I will be presenting “Securing Exchange Online”: In this session, … Continue reading "I'll be speaking at E-Communications & Collaboration Day 2017 (BE-COM.eu) on May 3rd 2017"