The Person Behind Core365.Cloud

Practical infrastructure, Windows administration, and cloud lessons—straight from real-world work.

Hi, I’m Antonio Rennvick — IT Infrastructure Manager, Microsoft MCT in the Making, and the Person Behind Core365 Cloud.

I’ve spent over a decade working in enterprise IT environments, and if there’s one thing I’ve learned, it’s that the gap between official Microsoft documentation and what actually works in production is enormous. That gap is exactly why this blog exists.

My Background

I’m an IT Infrastructure Manager with 15+ years of hands-on experience managing complex enterprise infrastructure — Active Directory forests, hybrid Microsoft 365 deployments, Azure cloud environments, and everything in between.

I hold the following Microsoft certifications:

• AZ-104 — Microsoft Certified: Azure Administrator Associate
• MS-102 — Microsoft Certified: Microsoft 365 Administrator Expert

My career has been built inside large corporate environments where the stakes are real: thousands of users, multi-site AD topologies, compliance requirements, and zero tolerance for downtime. I’ve dealt with the domain controller failures, the replication nightmares, the Kerberos misconfigurations, and the 2 AM calls that none of the documentation ever prepared me for.

That experience is what I write about here.

Why I Started This Blog

Most IT content on the internet falls into one of two categories: too basic to be useful, or too theoretical to be actionable. I wanted something different — a resource written by someone who actually manages enterprise environments day to day, for the sysadmins and IT pros who are doing the same.

Core365 Cloud is where I document the real stuff: PowerShell scripts that solve actual problems, Active Directory configurations that hold up under pressure, Microsoft 365 and Azure guides that go deeper than the official docs, and security hardening advice drawn from enterprise experience.

Every article on this blog is written from the field, not from a test lab.

What You’ll Find Here

• PowerShell automation — scripts for AD management, reporting, monitoring, and remediation
• Active Directory deep dives — tiered administration, replication troubleshooting, security hardening
• Microsoft 365 & Azure — real-world configuration guides for enterprise environments
• Security & identity — Microsoft Entra, conditional access, zero trust, DNSSEC, and more
• IT Operations — troubleshooting, event log analysis, DNS, and Windows Server

Beyond the Blog

I also build tools for IT professionals through Core365 Cloud, including PowerShell-based utilities and WordPress plugins designed for sysadmin use cases. My open-source scripts are available on GitHub — feel free to use, fork, and contribute.

If you manage Active Directory, Microsoft 365, or Azure in an enterprise environment, you’re in the right place.

Get in Touch

Have a question, a topic you’d like me to cover, or just want to connect with a fellow IT pro? Reach out through the Contact page or join the conversation in the Core365 Facebook Group.

— Antonio Rennvick
IT Infrastructure Manager | AZ-104 | MS-102 | Founder, Core365 Cloud

🔗 Connect with me on LinkedIn: https://www.linkedin.com/in/antoniorennvick