Microsoft 365 is the productivity platform of choice for many financial advisors, CPA firms, accounting practices, and wealth management companies. It powers email, file sharing, collaboration, and remote work, making it one of the most valuable systems in your business.
It is also one of the most targeted.
Cybercriminals know that a compromised Microsoft 365 account can provide access to sensitive client information, financial documents, internal communications, and cloud storage. That's why securing Microsoft 365 should be a top priority for every financial services firm.
In this guide, we'll explain the essential Microsoft 365 security best practices that help protect financial organizations from today's most common cyber threats.
Disclaimer: This article is intended for educational purposes only and should not be considered legal or regulatory advice. Financial firms should consult qualified legal and compliance professionals regarding applicable regulations and security requirements.
Why Microsoft 365 Is a Prime Target
Most successful cyberattacks begin with a compromised user account.
If attackers gain access to Microsoft 365, they may be able to:
- Read confidential email
- Access OneDrive files
- Download SharePoint documents
- Impersonate employees
- Launch phishing attacks
- Steal financial information
- Create hidden mailbox rules
- Maintain persistent access
Because Microsoft 365 stores so much business-critical information, protecting it requires more than simply creating strong passwords.
10 Microsoft 365 Security Best Practices
1. Enable Multi-Factor Authentication Everywhere
Every Microsoft 365 user should be protected with Multi-Factor Authentication (MFA).
This single security control significantly reduces the risk of compromised passwords leading to unauthorized access.
Protect:
- Teams
- SharePoint
- OneDrive
- Exchange Online
- Administrator accounts
2. Disable Legacy Authentication
Older authentication protocols often bypass modern security controls.
If legacy authentication remains enabled, attackers can exploit it even when MFA is configured.
Review your Microsoft 365 environment and disable outdated authentication methods whenever possible.
3. Use Conditional Access Policies
Conditional Access allows organizations to control who can access Microsoft 365 based on factors such as:
- User identity
- Device compliance
- Geographic location
- Risk level
- Sign-in behavior
These policies add another layer of protection without disrupting legitimate users.
4. Protect Administrator Accounts
Administrative accounts should receive additional security protections.
Best practices include:
- Dedicated admin accounts
- MFA
- Strong password policies
- Least privilege access
- Regular access reviews
Never use a daily email account as a global administrator.
5. Enable Advanced Email Security
Email remains the leading attack vector.
Microsoft 365 should include protections such as:
- Anti-phishing policies
- Safe Links
- Safe Attachments
- Spoof protection
- Malware filtering
Combined with user training, these controls dramatically reduce phishing risk.
6. Secure SharePoint and OneDrive
File sharing is essential, but unrestricted sharing creates unnecessary risk.
Review:
- External sharing permissions
- Anonymous links
- Guest access
- Data retention
- File permissions
Financial firms should periodically audit who has access to sensitive information.
7. Monitor Sign-In Activity
Review Microsoft Entra ID sign-in logs for unusual activity such as:
- Impossible travel
- Multiple failed logins
- Suspicious locations
- Anonymous IP addresses
- Repeated password attempts
Early detection can prevent larger incidents.
8. Implement Data Loss Prevention (DLP)
Data Loss Prevention policies help reduce accidental exposure of sensitive information.
Examples include:
- Social Security numbers
- Bank account numbers
- Tax information
- Client financial records
DLP policies can alert users or automatically block inappropriate sharing.
9. Train Employees Regularly
Technology alone is not enough.
Employees should receive ongoing security awareness training covering:
- Phishing emails
- QR code scams
- Business Email Compromise
- Password security
- Safe document sharing
- Remote work security
Well-trained employees are one of your strongest defenses.
10. Work with an Experienced Microsoft 365 Partner
Microsoft 365 includes hundreds of security settings. Many organizations never configure them correctly.
An experienced Managed Service Provider can help:
- Configure security baselines
- Review permissions
- Implement Conditional Access
- Monitor security alerts
- Manage licensing
- Maintain compliance-focused configurations
How Torch Networks Secures Microsoft 365
Microsoft 365 administration is included as part of our managed IT services for many clients.
Our team helps financial organizations:
- Configure Multi-Factor Authentication
- Secure Exchange Online
- Protect Teams and SharePoint
- Review user permissions
- Implement Conditional Access
- Strengthen email security
- Monitor Microsoft 365 security alerts
- Manage user accounts and licensing
- Coordinate with Microsoft support when needed
We believe Microsoft 365 should improve productivity without increasing cyber risk.
Common Microsoft 365 Security Mistakes
Many organizations unintentionally leave themselves vulnerable by:
- Not requiring MFA for all users
- Sharing files publicly
- Leaving former employee accounts active
- Granting excessive administrator permissions
- Ignoring security alerts
- Failing to review guest access
- Never auditing mailbox rules
- Assuming Microsoft automatically secures every setting
A proactive review can identify these gaps before attackers do.
Frequently Asked Questions
Is Microsoft 365 secure enough for financial firms?
Microsoft 365 provides powerful security capabilities, but they must be properly configured and managed. A secure environment combines Microsoft's built-in features with strong policies, monitoring, and user awareness.
Does Microsoft 365 include Multi-Factor Authentication?
Yes. Microsoft supports Multi-Factor Authentication, but organizations are responsible for enabling and managing it.
What is Conditional Access?
Conditional Access allows organizations to define rules that control access based on user identity, device compliance, location, and risk signals.
Can Microsoft 365 help prevent phishing?
Yes. Microsoft offers advanced email security features such as anti-phishing protection, Safe Links, and Safe Attachments. These are most effective when combined with employee security awareness training.
Does Torch Networks manage Microsoft 365?
Yes. We help financial firms administer Microsoft 365, strengthen security, manage licensing, support users, and implement security best practices as part of our managed IT services.
Secure Your Microsoft 365 Environment
Microsoft 365 is one of the most important platforms in your business. Taking the time to configure it properly can significantly reduce your cybersecurity risk and improve your firm's resilience.
If you're unsure whether your Microsoft 365 environment follows current security best practices, Torch Networks can help.
Our team provides complimentary Microsoft 365 security assessments for financial services firms. We'll evaluate your current configuration, identify potential security gaps, and provide practical recommendations to help protect your users, your data, and your business.
