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Franz Korbjuhn
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Articles

Category: IT security

Access rules, admin rights and protection features: how to secure Microsoft 365 and the environment behind it.

Emails pass through a filter gate with a shield into the office, suspicious messages with warning signs, one with a crown posing as the boss, end up in a quarantine box, and a copy of every email goes to the archive
IT security

Hornetsecurity for Microsoft 365: when additional email security makes sense

Why I usually add Hornetsecurity for email protection when clients use Business Standard, how the switch works, and when I recommend Business Premium instead.

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Floor plan of a practice with reception, treatment room, office, server room and a waiting area with Wi-Fi, all connected through a central firewall, with backups passing through a second stage into a data centre
IT security

IT for medical practices: coordinating practice software, network and backup

What the KBV's IT security guideline requires of practices, where the TI service provider's job ends, and how I set up the practice network and backup.

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Servers and computers marked with red padlocks, next to a separate data vault from which the data flows back along a line
IT security

A ransomware attack in practice: 60 employees back at work within 48 hours

Every computer and file share encrypted, but not the backups. How an offline backup brought a company back without paying a ransom, in which order the systems returned and what changed afterwards.

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A central office building linked by secured connections to a factory, a warehouse and smaller businesses, one of them highlighted
IT security

NIS2 and small businesses: checking whether it applies, preparing IT measures

NIS2 has applied in Germany since December 2025. Whether a business is in scope depends on sector, size and structure. Small businesses are often affected indirectly, as suppliers or service providers to customers in scope.

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Business Premium security features as switches, only a few of them turned on
IT security

Microsoft 365 Business Premium: security features you can use

Conditional Access, Intune, Defender and archiving are included in Business Premium but still have to be set up. What the licence contains, where I start and why PIM needs an add-on licence.

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