Whether you’re a scrappy start-up, a mid-sized mover, or a sprawling enterprise, one thing’s universal: your data needs guarding. And not just a polite lock on the front door. Think steel vault, motion sensors, and a rottweiler named MFA.
From usernames and passwords to intellectual property, client records, and employee info – if it lives in your Microsoft 365 tenant, it’s a target.
Fortunately, Microsoft gives you a decent security toolkit out of the box.
But if you want the good stuff – the kind of tenant hardening that actually keeps attackers out – you’ll need to level up your licensing.
Microsoft 365 Licensing Matrix
Check out the M365 Feature Matrix to see what lights up with each license tier.
Advanced Threat Protection
Insider Risk & Compliance
Strike a balance: Yes, you need to balance security with usability and cost, but there are some absolute, non-negotiable basics that every tenant should have in place—no excuses.
Your “security posture” is just a fancy way of saying: how seriously do you take protecting your stuff? If you’re in a regulated industries like finance, healthcare, legal and others then you’ve got acronyms like FCA, GDPR, SEC, SOX, and HIPAA breathing down your neck. That means your posture needs to be more Iron Man than SpongeBob.
Even if you’re not in a regulated space, you still owe it to your clients, staff, and stakeholders to keep their data safe. Charities, not-for-profits, cupcake shops – everyone’s got something worth protecting.
I often use this analogy: imagine a scale from a family-run cupcake business to a government agency with black helicopters. Their security needs are wildly different, but there’s a shared baseline for tenant hardening that everyone should cover.
If you take one thing from this post, let it be this: Multi-factor authentication (MFA) is not optional. It’s the single most effective control you can implement – no cost, massive impact. MFA should be the first, most urgent step in your security journey.
Microsoft once said MFA blocks 99.9% of account compromise attacks. That statistic has been memed to death and somewhat of a security industry cliché, but the truth still holds. Without MFA, you’re basically leaving your tenant’s front door wide open with a “please don’t hack me” sign.
MFA isn’t a silver bullet—but it is the foundation. Without it, every other security measure you deploy is compromised from the outset.
Passwords Alone Are Not Enough
And no, your 24-character password with symbols and emojis isn’t enough. Even complex passwords get phished, guessed, or stolen.
Wondering if your password has been compromised? Have a look here: https://haveibeenpwned.com/
Have I Been Pwned is a free resource for anyone to quickly assess if they may have been put at risk due to an online account of theirs having been compromised or “pwned” in a data breach.
MFA is your second line of defence – and it needs to be phishing-resistant. Basic methods like SMS or voice call can be bypassed via SIM-swapping or phishing proxies. That’s why Microsoft now strongly recommends phishing-resistant MFA:
Administrator Accounts
Administrators should be provided with dedicated admin accounts that do not carry permanent administrative rights. Access should be secured with phishing-resistant MFA. When elevated privileges are required, administrators must use Privileged Identity Management (PIM) to assign the least privilege necessary for the shortest possible duration. Standard user accounts should never be elevated to perform administrative tasks.
Microsoft 365 provides a scalable security framework that allows businesses to start with essential protections and evolve into advanced, compliance-driven security postures. Here’s how that journey looks:
By starting with the basics and scaling up, you can align your Microsoft 365 security posture with your business needs, regulatory obligations, and risk appetite. Whether you’re baking cupcakes or building rockets, the tenant hardening journey starts with locking the front door.