Remote and hybrid work is now a permanent fixture for most Toronto businesses. But enabling remote access without proper security controls creates serious risk. Here is how to set up Microsoft 365 so your team can work from anywhere — safely.
Remote Work Is Permanent. The Security Question Is Not Optional.
The shift to remote and hybrid work that accelerated across Toronto in 2020 did not reverse. For most professional services firms — law offices, accounting practices, healthcare administrators, financial advisors — some version of remote or hybrid work is now a permanent operating reality.
Microsoft 365 makes remote work technically straightforward. Email, Teams, SharePoint, and OneDrive give distributed teams everything they need to collaborate. The problem is that remote access fundamentally changes your security perimeter. When your staff worked exclusively in the office, your firewall and physical premises provided a layer of protection. With remote work, people are connecting from home networks, coffee shops, personal devices, and hotel WiFi — environments you have no control over.
Setting up remote work without addressing these security gaps is not a minor oversight. It is one of the most common ways Toronto SMBs end up compromised. This guide walks through the essential steps to enable remote work in Microsoft 365 securely — covering identity, devices, data, and communication.
Step 1: Lock Down Identity With MFA and Conditional Access
Multi-Factor Authentication Is Non-Negotiable
Every remote access story that ends badly starts the same way: a password was stolen, guessed, or phished, and there was nothing else standing between the attacker and the account. Microsoft reports that enabling MFA blocks over 99% of automated account compromise attacks.
Before you enable remote access for anyone, MFA must be turned on for every account in your tenant — not just admins, not just executives. Every user. Remote access without MFA is an open door.
Use the Microsoft Authenticator app rather than SMS codes. SMS-based MFA is better than nothing but is vulnerable to SIM-swapping attacks. The Authenticator app generates time-based codes locally and is significantly more secure.
Conditional Access: Control Where and How People Sign In
Conditional Access policies let you define rules for access. Common policies for remote workforces include: requiring MFA for every sign-in outside the office network, blocking sign-ins from countries you do not operate in, and restricting access from devices that do not meet minimum security requirements. Microsoft's Conditional Access documentation provides templates you can adapt for your environment.
One critical policy to implement immediately: block legacy authentication. Legacy protocols like IMAP, POP3, and basic SMTP authentication bypass MFA entirely. Disabling them forces all clients to use modern authentication, closing one of the most frequently exploited gaps in Microsoft 365 environments.
Step 2: Manage Devices Accessing Company Data
Microsoft Intune for Device Management
When employees work remotely, you lose visibility into the devices connecting to your environment. Microsoft Intune — included in Microsoft 365 Business Premium — is a cloud-based device management platform that lets you enforce security policies on both company-owned and personal devices. You can require compliant device policies such as: minimum OS version, disk encryption enabled, screen lock after inactivity, and antivirus running before a device is allowed to access company data.
For personal devices (BYOD — bring your own device), Intune supports app protection policies that sandbox company data within managed apps without controlling the rest of the device. Your staff can use their personal phone for Teams and Outlook while company data stays protected and can be remotely wiped if the device is lost or the employee leaves.
Require BitLocker Encryption on Windows Devices
Any Windows laptop used for remote work should have BitLocker full-disk encryption enabled. If a laptop is lost or stolen, BitLocker ensures the data on it is unreadable without the decryption key. This is a baseline requirement under both PIPEDA and most cyber insurance policies — and it takes minutes to enable.
Through Intune, you can enforce BitLocker enrollment across all managed Windows devices and escrow recovery keys in Microsoft Entra ID, so you have a recovery path if a user forgets their PIN.
Step 3: Use Microsoft Teams Properly — and Securely
Teams is the communication backbone for most remote Microsoft 365 deployments. It handles chat, video calls, file sharing, and project collaboration. It is also a potential data leakage vector if not configured correctly.
External access settings: By default, Teams allows users to chat and call people outside your organization. Review whether this is appropriate for your business. For many professional services firms, external Teams communication should be restricted or require explicit approval.
Guest access: Guest access lets people outside your organization join Teams channels. This is useful for client collaboration but requires governance. Guests should only be added to specific teams, not given broad access, and guest accounts should be reviewed and removed regularly.
Meeting security: Configure lobby settings so external participants wait for admission rather than joining directly. Require meeting organizers to admit guests manually for sensitive meetings — client calls, board discussions, anything involving confidential information.
The Canadian Centre for Cyber Security's guidance on telework recommends treating all remote communication tools as potential data exposure points and configuring them with the assumption that unauthorized access is possible.
Step 4: Secure File Access With SharePoint and OneDrive
Replace the VPN-to-File-Server Model
Many Toronto businesses still have staff connecting via VPN to access a file server in the office. This architecture is increasingly obsolete — VPNs are difficult to manage, create performance bottlenecks for remote users, and have been a significant attack vector in recent years. Migrating file storage to SharePoint Online and OneDrive eliminates the need for VPN-based file access entirely.
With SharePoint and OneDrive, files are accessible from any device, anywhere, with access controlled by Microsoft Entra ID identity — meaning MFA and Conditional Access apply to every file access attempt, not just the initial VPN login.
Tighten External Sharing
The default SharePoint and OneDrive configuration allows users to share files with anyone using an anonymous link — no sign-in required. For a remote workforce where staff are regularly sharing files with clients and partners, this default creates unnecessary risk.
Set your external sharing level to require recipients to sign in with a Microsoft account or a verification code. Enable link expiration for externally shared files. Disable the "Anyone with the link" sharing option for sensitive libraries containing client data, financial records, or health information.
Step 5: Implement a Cloud Backup Strategy
A common and dangerous misconception: because files are in the cloud, they are backed up. They are not — at least not in the way most business owners assume. Microsoft's shared responsibility model places data protection responsibility on the customer. Accidental deletion, ransomware encryption of synced files, and malicious insider activity are not covered by Microsoft's infrastructure redundancy.
For a remote workforce where files are almost entirely cloud-based, a third-party backup covering Exchange Online, SharePoint, and OneDrive is essential. Back up to a separate storage location — not the same Microsoft tenant — so that a compromise of your Microsoft environment does not also compromise your backups.
Step 6: Set Clear Remote Work Security Policies for Staff
Technology controls only go so far. Remote work security also depends on staff behaviour — and staff behave better when expectations are clear and communicated.
Home network security: Require staff to use a password-protected WiFi network at home. Public WiFi — coffee shops, libraries, hotels — should only be used with a VPN. Provide a recommended VPN option or include it in your IT stack.
Screen lock and physical security: Require automatic screen lock after a short period of inactivity. Remind staff that family members and roommates should not have access to work devices.
Phishing awareness: Remote workers receive more targeted phishing attempts than office-based staff, partly because attackers know they are more isolated from colleagues who might spot a suspicious email. Regular phishing awareness training is more important, not less, in a remote environment.
The Office of the Privacy Commissioner of Canada publishes practical guidance on privacy and security expectations for remote employees that is worth sharing with your team.
Step 7: Monitor and Respond
A secure remote workforce is not a one-time configuration project — it requires ongoing monitoring. Microsoft 365 Defender and the Microsoft Secure Score portal provide continuous visibility into your security posture, flagging risky sign-ins, unusual file access patterns, and configuration drift.
Set up alerts for high-risk sign-in events: logins from new countries, multiple failed authentication attempts, logins outside normal business hours. These are early warning signs of account compromise that are far cheaper to respond to early than after the fact.
If monitoring and response is not something your internal team has capacity for, a managed IT provider with 24/7 monitoring capabilities can provide this coverage as part of a flat monthly arrangement — no additional staffing required.
A Checklist for Remote Microsoft 365 Security
✓ MFA enabled for all users using the Authenticator app
✓ Conditional Access policies configured, including legacy auth blocked
✓ Intune device management deployed with compliance policies
✓ BitLocker encryption enforced on all Windows laptops
✓ Teams external access and guest access reviewed and restricted appropriately
✓ SharePoint and OneDrive external sharing restricted; anonymous links disabled
✓ Third-party backup covering Exchange, SharePoint, and OneDrive
✓ Remote work security policy communicated to all staff
✓ Microsoft Secure Score reviewed and high-impact items actioned
✓ Sign-in risk alerts configured in Microsoft Entra ID
Need Help Configuring This for Your Toronto Business?
Properly securing a remote Microsoft 365 environment involves a lot of moving parts — identity, devices, data, communication, and monitoring all need to work together. Our cloud services team and cybersecurity specialists work with Toronto SMBs to design, implement, and maintain remote work environments that are both functional and secure.
Contact us for a free Microsoft 365 remote work assessment. We will review your current configuration, identify the gaps, and give you a clear plan for addressing them — whether you engage us to do the work or handle it internally.