The last couple of weeks I have been working with several Microsoft Exchange Server environments. I encountered lots of expired certificates. Organizations wanted help with that. One of the questions that kept coming back was: Do I press Yes to change the default certificate, when I enabled the certificate for SMTP? The official answer is … Continue reading "Field notes: What is the current default SMTP certificate for your Exchange Server environment?"
Last week an announcement was made: The native mail app in Apple's iOS has zero-day vulnerabilities, deemed critical. No patch is available at this time. More information about the vulnerability can be found here. For you as IT admin this means that you probably have work to do. The main questions you may be facing … Continue reading "Security Officer: Please block the iOS native mail app (for) now!"
As a consultant, I see a lot of different environments. Often, I need to know the answer to one of the most important questions: What did you select during the setup of Azure AD Connect? The answers vary: A colleague did the setup and has left the company, department… A external supplier did the setup … Continue reading "Field Notes: How has your Azure AD Connect been configured?"
In my previous blog post Field Notes: Azure AD Identity Protection we looked at the administrator perspective on Identity Protection. The focus was how to protect your corporate accounts. In this blog the focus is the end-user (employee and IT staff) experiences. The experiences I want to share are: Suspicious Activity User with a high-risk … Continue reading "Field notes: Azure AD Identity protection end-user perspective"
I'm managing several Azure AD tenants with a wide variety of licenses and settings. I've had a focus on Azure AD Identity Protection for the last weeks, so I'm sharing my field notes with you. What is Azure AD Identity Protection? Let's start with a little introduction. Microsoft has a lot of experience with identities … Continue reading "Field notes: Azure AD Identity Protection"
In my previous blogpost, I described how to enroll Valimail Monitor for Office 365. The initial setup is based on credentials, stored at Valimail. This results in another set of credentials that needs to be remembered, needs to be stored in a password vault, another set that may be leaked… Additional admins and/or auditors also … Continue reading "Enable Valimail Single Sign-On with Azure Active Directory"
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"
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”"
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"
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"