Microsoft 365 Hardening
Microsoft 365 Security for Small Businesses
Your Microsoft 365 account is the front door to your entire business—email, files, Teams, contacts. Out of the box, it's not locked. Phishing attacks targeting M365 accounts are the most common entry point for business email compromise and data breaches. We harden your setup so those attacks don't get through.
Or email brady@phenicie.com. No phone call required.
Microsoft 365 Security Risks Most Businesses Miss
No multi-factor authentication
MFA is off by default for new accounts. Without it, one stolen password gives an attacker full access to every email, file, and contact.
Legacy authentication enabled
Older protocols like IMAP and POP3 bypass MFA entirely. Attackers specifically target these to get around your authentication requirements.
No email authentication records
Without SPF, DKIM, and DMARC, anyone can send emails that appear to come from your domain. Your clients get fake invoices that look real.
Overly permissive sharing settings
Default OneDrive and SharePoint settings often allow anyone with a link to access shared files—including people outside your organization.
Audit logging off
By default, M365 audit logs may not be configured to retain sign-in and activity data. When something goes wrong, you may not be able to tell what happened.
No phishing simulation training
Employees who've never seen a convincing phishing email are far more likely to click one. Regular simulations train the most important security layer: your team.
What We Configure & Manage
A complete Microsoft 365 security hardening engagement covers every layer of your M365 environment.
Identity & Access
- ✓ Multi-factor authentication (MFA) for all users
- ✓ Conditional Access policies for risky sign-ins
- ✓ Privileged Identity Management for admin accounts
- ✓ Legacy authentication protocol blocking
- ✓ Break-glass emergency access accounts
Email Security
- ✓ Anti-phishing policies with impersonation protection
- ✓ Anti-malware and anti-spam configuration
- ✓ Safe Links and Safe Attachments (Defender for O365)
- ✓ Email authentication: SPF, DKIM, DMARC
- ✓ External email warning banners
Data & File Security
- ✓ SharePoint and OneDrive sharing restrictions
- ✓ Sensitivity labels for confidential files
- ✓ Data Loss Prevention (DLP) policies
- ✓ Guest access controls and review
- ✓ Retention policies for compliance
Monitoring & Response
- ✓ Audit logging enabled and retained
- ✓ Alerts for suspicious sign-in activity
- ✓ Microsoft Secure Score review and improvement
- ✓ Quarterly security configuration reviews
- ✓ Incident response documentation
Microsoft 365 Security FAQ
Is Microsoft 365 secure by default for small businesses?
Not fully. Microsoft 365 has strong security capabilities, but most security features are turned off by default or require configuration. Without proper hardening—multi-factor authentication, Conditional Access policies, email authentication, and audit logging—your M365 environment has significant gaps that attackers actively exploit.
What is business email compromise (BEC) and how does M365 security prevent it?
Business email compromise is when an attacker gains access to a business email account and uses it to send fraudulent invoices, redirect payments, or steal sensitive data. Microsoft 365 security hardening prevents BEC by requiring MFA on all accounts, enabling advanced anti-phishing policies, and setting up email authentication records (SPF, DKIM, DMARC).
What Microsoft 365 security settings should every business have?
Every Microsoft 365 business should have: MFA on all accounts, Conditional Access policies, anti-phishing policies, Safe Links and Safe Attachments, email authentication (SPF, DKIM, DMARC), audit logging, disabled legacy authentication, and external email warnings. Most small businesses have none of these configured.
How much does Microsoft 365 security hardening cost?
A one-time Microsoft 365 security audit and hardening for a small business (under 20 users) typically runs $300–$800 depending on your current configuration. Ongoing management of M365 security settings is included in our managed IT plans.
Does Microsoft Teams have security risks?
Yes. Microsoft Teams security risks include external guest access to internal channels, phishing through Teams messages, and overly permissive meeting settings. Proper Teams security configuration includes limiting external access, enabling sensitivity labels, and configuring meeting security policies.
Lock Down Your Microsoft 365 Today
Text SECURE to (406) 382-9207 or email brady@phenicie.com for a free M365 security review. No phone call required.