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Category Archives: Exchange Online

Exchange Online

Valimail Monitor for Office 365: Your Free DMARC Reporting Tool

Written on July 11, 2019 at 3:56 PM, by

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 […]

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

Written on April 8, 2019 at 10:00 AM, by

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 […]

TOOL: My own Exchange Move Request Report script

Written on January 28, 2019 at 6:00 PM, by

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 […]

The mysterious case of a failed account recovery and orphaned mailbox

Written on January 14, 2019 at 11:25 AM, by

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 […]