Hi 👋, I’m Dimosthenis

Dimosthenis Senior Cloud Architect focused on Microsoft 365 and Microsoft 365 Security using Microsoft Defender products, with extensive hands‑on experience designing, securing, and operating enterprise‑scale environments.

In parallel, I serve as CIO/CISO at the second‑largest flour milling and food manufacturing organization in Greece, where I apply Microsoft 365 and Microsoft 365 Security technologies in real‑world, high‑impact production scenarios.

I write deep‑dive technical content for security architects, IT professionals, and administrators who actively run these platforms in production, covering hardening guides, configuration walkthroughs, real‑world detections, and lessons learned the hard way. This dual role allows me to translate complex security challenges into practical guidance, community content, and actionable best practices for the Microsoft professional community.

🆕 New: Microsoft 365 features are now tagged by [Release Status].

🚧 Preview vs ✅ Generally Available. Know at a glance which features are safe to deploy in compliance-regulated environments. Pick a topic from the menu above, or start with the latest posts below.

Microsoft 365 Security Insights blog — Microsoft 365 security and Defender content for IT Pros

Microsoft 365 Security Blog: Hands-On Guides for IT Pros

An intro to the blog, the topics I’ll cover, and the first series planned for 2026.

Microsoft Secure Score για τον Έλληνα ΥΑΣΠΕ (NIS2

Microsoft Secure Score: Πρακτικός Οδηγός για τον ΥΑΣΠΕ NIS2

Πρακτικός οδηγός Microsoft Secure Score για τον Έλληνα junior μηχανικό και Υ.Α.Σ.Π.Ε. — από το score στην πραγματική μείωση κινδύνου, στο πλαίσιο NIS2 και του Νόμου 5160/2024.

Microsoft Secure Score dashboard used as GRC engine for ISO 27001:2022 and NIS2 Article 21 compliance, Gold Award winner

Microsoft Secure Score as a GRC Tool for ISO 27001 & NIS2

Series introduction: the mid-market GRC problem, how Microsoft Secure Score covers 60–70% of ISO 27001:2022 Annex A and NIS2 Article 21 controls automatically, the four building blocks of the Gold-Award programme, and the recommended reading path for the full series.

Microsoft Secure Score recommendation details pane in the Microsoft Defender portal — fields explained for junior administrators

Microsoft Secure Score Part 1: How to Read a Recommendation

Part 1 of the Secure Score series. A beginner-friendly walk through a single Microsoft Secure Score recommendation. Every field on the screen, what each one means, and the small observations that help new professionals start extracting value in under an hour.

Microsoft Secure Score in the Microsoft Defender XDR ecosystem — how Entra ID, Defender for Endpoint, Office 365, and Purview feed the score

Microsoft Secure Score Part 2: Inside the Defender Ecosystem

Part 2 of the Secure Score series. Where Microsoft Secure Score physically lives, how it feeds off the Microsoft Defender family, what each source product contributes, and a practical exercise to trace one score point back to the product that generated it.

Microsoft Secure Score operational workflow — prioritization, change management, and compliance mapping for ISO 27001 and NIS2

Microsoft Secure Score Part 3: Daily Operations & ISO 27001

Part 3 of the Secure Score series. How to actually run Microsoft Secure Score day-to-day: prioritizing 260+ recommendations, building a change management process that doesn’t break production, mapping controls to ISO 27001 and NIS2, collecting audit evidence, and reporting to the board.

The Microsoft Defender family, as Microsoft itself organises it

Microsoft Defender Part 1: All Products, Which One Do You Need

Confused by Microsoft Defender naming? You’re not alone. This guide maps the entire Microsoft Defender family, 8 core products, licensing tiers, and when you actually need each one. For CISOs, IT managers, and security teams implementing Microsoft 365 E5 or EMS E5.