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Michael Reinders

Petri Contributor

Michael has been an IT Pro since 1998. He has worked predominantly in the Windows world including client and server operating systems, on-prem systems engineering (AD, DNS, etc.), and over the last ten years or so has embraced and immersed himself in all things Microsoft 365 - including Exchange Online, SharePoint Online, Teams, OneDrive, and Microsoft Entra ID. He has written articles here on Petri based on these technologies. Michael strives to help other IT Pros with getting more efficient (especially with PowerShell) in their day-to-day tasks and offering solid assistance on larger projects.

LATEST

Hero approved Microsoft 365

Mastering Microsoft 365 Administration: A Guide to Microsoft’s Various Admin Centers

Last Update: Jul 25, 2023

Microsoft provides a comprehensive suite of tools for effectively administrating and managing various aspects of the Microsoft 365 platform. There’s not just one Office 365 portal, IT pros actually have access to various admin centers, each tailored to manage specific aspects of the platform. In this article, we will explore the key admin centers available…

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Windows

Troubleshooting Guide: Fixing the “User Profile Service Failed The Sign-In” Error

Last Update: Sep 26, 2024

Encountering the “User profile service failed sign-in” error message can be frustrating and prevent you from accessing your logon user account on Windows. This error typically occurs due to issues with the user profile, and it can affect both local and domain accounts. In this article, I will provide a comprehensive troubleshooting guide to help…

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Network Security

Nested Microsoft 365 Groups: What You Need to Know

Last Update: Jun 05, 2025

Office 365 nested groups refer to the practice of creating a group within another group in the Microsoft 365 ecosystem using the dynamic functionality in Azure AD. For IT admins, this practice lets them organize groups in a hierarchical manner, enabling a more structured approach to managing access, permissions, and collaboration within an organization. Membership…

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Microsoft Outlook

How To Enable Archive Mailboxes In Office 365

Last Update: Jun 08, 2025

In the ever-evolving digital landscape, organizations are generating an increasing volume of emails and other electronic communications. Efficiently managing this growing influx of messages while maintaining compliance with regulatory requirements has become a critical aspect of modern business operations. One effective solution offered by Microsoft’s Office 365 suite is the archive mailbox feature. In this…

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Cloud Computing

How to Use Microsoft 365 Dynamic Groups to Streamline Access Management

Last Update: Jul 13, 2023

In today’s dynamic business landscape, managing user access to resources is critical for organizations. Azure Active Directory (AAD), a comprehensive identity and access management solution from Microsoft, offers a powerful feature called dynamic groups. These dynamic user groups provide a flexible and automated approach to managing user access based on predefined rules and user attributes….

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Teams hero approved 2

How Microsoft Teams Meeting Notes Can Supercharge Your Meeting Efficiency

Microsoft Teams Meeting Notes is a feature in the Teams and Outlook apps that allows you to take collaborative notes during meetings in Microsoft Teams. Meeting Notes are Loop components stored in the chat transcript for the meeting, so you can easily access them later or share them elsewhere. In this article, I will show…

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Outlook – 1

How to Import PST Files to Office 365

Last Update: Jul 24, 2023

As an IT pro, the process of exporting users’ mailboxes to PST is rather straightforward. However, importing PST email and calendar items into new mailboxes can be tricky. In this article, I will detail how to import PST files to Office 365 using either Outlook or the Microsoft Purview Compliance portal and Azure AzCopy. How…

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Microsoft 365 Apps

How To Block Senders in Office 365 – o365 Block Sender Guide

Last Update: Jun 08, 2025

There are quite a few methods IT Pros can use to block malicious and harmful emails from flowing into their organizations. Similar to my previous post on adding a whitelist email address or domain to your Microsoft 365 settings, I’m going to detail different methods to block senders in Officer 365 and offer some commentary…

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Outlook – 1

How to Get Started With Exchange Online Archiving

Last Update: Aug 11, 2023

Microsoft Exchange Online Archiving allows you to alleviate issues your users run into when their mailboxes approach their allocated quota. As an IT admin, Exchange Online Archiving is a really powerful tool that should not be overlooked. In this article, I’ll examine why archiving is necessary and how to enable Exchange Online Archiving to help…

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Outlook – 1

How To Export An Office 365 Mailbox To PST Files: A Complete Guide

Last Update: Jun 06, 2025

Microsoft has modified the procedures for IT Pros and Exchange Administrators to export mailbox items to a PST file. In an on-premises Exchange Server environment, it is quickly done from the Exchange Admin Center (EAC). However, in Office 365, it’s a little more complicated. Actually, it’s rather involved. Fear not – In this guide, I’ll…

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PowerShell

How to Connect to Exchange Online Using PowerShell

Last Update: Mar 04, 2026

Exchange Online PowerShell is a command-line tool that allows you to manage your Exchange Online mailboxes and users. It can be used to perform a variety of tasks, such as creating and managing mailboxes, configuring mail flow rules, and managing user permissions. In this guide, we’ll show you how to install and connect to Exchange…

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Outlook – 1

How to Whitelist a Domain in Office 365

Last Update: Jun 07, 2025

As an IT Pro, it is crucial to your organization to make sure that your users receive legitimate emails. Sometimes, Exchange Online Protection (EOP) can flag these emails as spam. Safely creating whitelists — also sometimes referred to as allowlists — for specific domains/email addresses allows you to efficiently manage email flow in your organization and…

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