M365 Post-Breach Security & Hardening

Your Microsoft 365 Environment Is Not Secure By Default.

Whether you're cleaning up after a breach or making sure there's never a first one, we rebuild Microsoft 365 tenants to a hardened baseline. An independent, specialized Microsoft 365 security practice. Conditional Access, MFA enforcement, Defender, Intune, and email authentication, done right the first time.

No obligation. A direct conversation about where your tenant actually stands.

What Gets Fixed First
  • MFA enforced across every user and admin account, legacy authentication blocked outright, and break-glass accounts secured with strong credentials and dedicated monitoring
  • Modern, phishing-resistant sign-in for users and admins, the default here, not the exception
  • Conditional Access policies closing the gaps attackers actually use
  • Defender for Office 365 tuned against real phishing and BEC patterns
  • SPF, DKIM, and DMARC actually enforcing, not just present
Remote-first. Working with clients nationwide.

Hardening work is mapped to the frameworks your auditors, insurers, and examiners already reference.

CIS Controls-Aligned NIST CSF-Aligned HIPAA-Aware SEC / FINRA-Aware Nationwide / Remote
The Problem

Your Microsoft 365 Tenant Is Not Secure By Default

Most tenants we get called into weren't breached because of a zero-day. They were breached because MFA wasn't enforced everywhere, a Conditional Access policy had a gap nobody caught, or years of turnover left configuration drift that nobody owned. Here's what's actually getting exploited.

No MFA Enforcement by Default

Microsoft's security defaults are easy to bypass, disable, or leave incomplete. Legacy auth, unmonitored break-glass accounts, and admin roles without phishing-resistant MFA are still some of the most common ways in.

Configuration Drift

Every added app registration, every new admin, every "just this once" exception adds up. Tenants get hardened once and never again. A few years in, nobody can say what's actually enforced versus what's just documented.

Compliance Exposure

Cyber insurance renewals, bar association obligations, and SEC/FINRA exams all assume a security baseline you may not actually have. Finding out during a claim or an audit is the expensive way to find out.

MFA Retirement Deadline

Microsoft Is Retiring SMS and Voice MFA. Is Your Tenant Ready?

Starting September 1, 2026, Microsoft begins auto-enrolling users who rely on SMS or voice for MFA into passkey registration prompts. On February 1, 2027, Microsoft-provided SMS and voice authentication is retired outright. Any user whose only MFA method is a phone number gets a blocking prompt to register a passkey before they can sign in again. There's no opt-out on that date.

Most tenants don't know how many of their users are actually still relying on it until someone checks.

Passkey Readiness Covers
  • Audit of exactly who in your tenant still depends on SMS or voice for MFA
  • Phishing-resistant passkey rollout for users and admins ahead of the deadline
  • Break-glass account continuity planning so the cutover doesn't lock out emergency access
  • Telecom provider configuration for any legitimate holdouts that still need SMS or voice
Who This Is For

Same Stack, Different Stakes

Any organization running Microsoft 365 is a fit. These three industries get hit hardest because of what a compromised inbox actually costs them.

Law Firms

Privilege Doesn't Protect an Inbox

Client confidentiality isn't a policy statement, it's the whole business. A compromised partner mailbox is a malpractice exposure and a bar association problem before it's anything else. We harden the controls that actually stop business email compromise: Conditional Access tuned to how attorneys really work (remote, mobile, multiple devices), MFA that doesn't get in the way of billable hours, and impersonation protection that catches both a spoofed lookalike and a genuinely compromised account before a wire instruction goes out under a partner's name.

BEC
The most common way a law firm's M365 tenant turns into a malpractice claim.
Wealth Management & Financial Advisors

Compliance Exams Don't Accept "We Meant To"

SEC and FINRA examiners ask for evidence, not intentions. An unenforced MFA policy or an undocumented admin exception is a finding waiting to happen, and it's exactly the kind of gap an attacker uses to move client money. We build the identity and access controls your compliance program already claims you have, and document them so the next exam is boring.

SEC / FINRA
Examiners expect documented, enforced controls, not a policy binder.
Construction

Wire Fraud Starts With One Compromised Inbox

Construction firms move large payments on tight timelines across a web of subcontractors, vendors, and title companies, which makes them one of the most targeted industries for business email compromise. A single spoofed change order or invoice can cost more than the entire year's IT budget. We lock down email authentication (SPF, DKIM, DMARC), Conditional Access, and Defender policies so a compromised vendor account can't turn into a six-figure wire transfer.

SPF/DKIM/DMARC
Enforced, not just published, so spoofed payment emails get stopped cold.

Working With a Cyber Insurance Carrier?

If you're here because a carrier, breach coach, or outside counsel needs proof of remediation before a policy renews or a claim closes, that's exactly the engagement we specialize in. We deliver the hardened configuration plus a dated report detailing exactly what was done, ready to hand to your carrier or counsel.

Book a Discovery Call
Services

Three Engagements, One Direction

From wherever your tenant is today to a hardened, monitored baseline. Pricing is scoped to your environment on a discovery call, not published here, because a five-user firm and a 400-user firm aren't the same engagement.

Assessment

Know Where You're Exposed

One-time engagement · 2 to 5 business days

A clear, prioritized picture of where your tenant is exposed, before you have to find out the hard way.

  • MFA and Conditional Access coverage review
  • Admin role and permissions audit
  • Compliance exposure mapping (HIPAA / SEC / FINRA-relevant controls)
  • Prioritized findings report in plain language, not a raw export
  • A straight answer on what needs fixing and why
Book a Discovery Call
Managed Security

Stay Hardened, Not Just Get Hardened

Ongoing · Monthly engagement

A hardened tenant on day one is not a hardened tenant a year from now. This keeps it that way.

  • Continuous drift monitoring against your baseline
  • Policy updates as Microsoft's defaults and your business change
  • Monthly compliance and Secure Score reporting
  • Direct access when something looks wrong, not a ticket queue
Book a Discovery Call

Just Been Breached? Start With the Jumpstart Bundle.

Assessment and Hardening combined into a single engagement, so you go from exposed to hardened without a gap in between. Ask about it on your discovery call.

Ask About Jumpstart
How It Works

From Breach to Baseline in Four Steps

1

Discovery Call

A direct conversation about where your tenant stands today, what's driving the urgency, and whether you need an assessment, a hardening project, or straight to Jumpstart.

2

Assessment

We go through your tenant's actual configuration, not a vendor checklist, and hand you a prioritized report of what's exposed and why it matters.

3

Hardening

Conditional Access, MFA, Defender, Intune, and email authentication get deployed and tuned to how your organization actually operates.

4

Ongoing Protection

Managed Security keeps the baseline enforced as Microsoft's defaults, your team, and your risk profile change.

About

Why Breach to Baseline

We founded Breach to Baseline on hands-on identity and security administration inside Microsoft 365 environments, earned through MSP work and post-breach remediation for organizations that found out the hard way what happens when a Conditional Access policy has a gap, or MFA isn't actually enforced everywhere it needs to be. We specialize in Entra ID, Conditional Access, Intune, Defender for Office 365, Exchange Online, and Purview, the identity and security stack that stops the incidents we get called in to clean up after.

Breach to Baseline exists because the same preventable gaps kept causing the same expensive incidents. The name is the mission: take an environment from wherever a breach, or the threat of one, leaves it, to an actual hardened baseline, and keep it there.

Get Started

Stop Waiting to Find Out the Hard Way.

Whether you're cleaning up after an incident or getting ahead of one, the fastest path to a hardened Microsoft 365 tenant starts with one conversation.

Remote-first. Working with clients nationwide.