A practical guide to Microsoft 365 migration for Canadian businesses. What to migrate, how to plan the cutover, what to do about email history, and how to avoid common problems.
Migrating to Microsoft 365 is one of the most common IT projects for Canadian small and mid-size businesses. Most businesses do it once, which means there is no institutional knowledge about what makes a migration go well or what the common failure points are.
This guide covers what a Microsoft 365 migration looks like in practice, what decisions need to be made before the cutover, and what to watch for on the other side.
What You Are Actually Migrating
A Microsoft 365 migration is not just a mail migration. Depending on what your business currently runs, the scope may include:
Email and calendar. Migrating mailboxes from on-premise Exchange, hosted Exchange, Google Workspace, or another provider into Exchange Online. This includes email history, calendar events, and contacts.
Files and documents. If the business currently stores files on local file servers or in Google Drive, migrating those into SharePoint document libraries and OneDrive means the files are accessible from anywhere and managed under Microsoft 365’s backup and retention policies.
Microsoft Teams. Setting up Teams for internal communication and replacing existing tools (Slack, Skype for Business, phone systems) is often part of a broader Microsoft 365 rollout.
Security configuration. Microsoft 365 Business Premium includes a significant security layer: Conditional Access policies, multi-factor authentication, Microsoft Defender for endpoint, and Intune for device management. Configuring these properly is part of a complete Microsoft 365 deployment.
Understanding the full scope before starting the project avoids situations where the email migration completes and the business discovers the file server migration was not planned.
Migration Planning
The most important work in a Microsoft 365 migration happens before the cutover, not during it.
Licence selection. Microsoft 365 has several business licence tiers. Microsoft 365 Business Basic includes web-only apps and no desktop Office. Business Standard adds desktop Office and advanced features. Business Premium adds full security capabilities. The right tier depends on your team’s needs. For most Canadian businesses, Business Premium is the recommended starting point because it includes the security features that make Microsoft 365 a complete platform rather than just email and apps.
DNS preparation. Email delivery requires DNS records (MX, SPF, DKIM, DMARC) to be updated at cutover. Understanding your current DNS setup and who manages your domain registrar is necessary groundwork. Errors in DNS records cause mail delivery failures, so this needs to be planned carefully.
Hybrid vs. cutover migration. For businesses migrating from on-premise Exchange, there is a choice between a cutover migration (everything moves on a single weekend) and a hybrid or staged migration (mail flows through both systems during a transition period). For small businesses under 100 mailboxes, a cutover migration is typically simpler. For larger or more complex environments, a phased approach reduces risk.
Data migration tooling. Microsoft provides native migration tools for Exchange to Exchange Online migrations. Third-party tools (BitTitan MigrationWiz, Microsoft FastTrack for larger organizations) are used for Google Workspace, IMAP, and other source systems. The choice of migration tool affects how email history, calendar events, and contacts are handled.
The Cutover Process
A well-planned Microsoft 365 cutover typically runs over a weekend with the following sequence:
- Accounts are pre-created and user profile settings are configured before the cutover weekend
- Email data is pre-migrated in the weeks before cutover to reduce the volume of mail that needs to move on cutover day
- On cutover day, a final delta migration runs to capture any remaining email
- DNS MX record is updated to point to Exchange Online, redirecting new inbound mail to Microsoft 365
- Users configure their Outlook clients to connect to the new Exchange Online mailbox
- Old mail system remains available for a short period for reference access
The most common issue during cutovers is DNS propagation time. After the MX record is updated, it takes time for the change to propagate globally. During this period, some mail may still arrive at the old server and needs to be forwarded. Planning for this window prevents lost mail.
Post-Migration Priorities
After the migration completes, several configuration items should be addressed:
Security baseline. MFA should be enforced on all accounts. Conditional Access policies should require compliant devices or managed devices for access to company resources. Microsoft Defender should be configured on all enrolled endpoints.
SharePoint and Teams setup. If files were migrated to SharePoint, permission structures need to be configured so the right people have access to the right content. Teams workspaces need governance policies to prevent sprawl.
Backup. Microsoft 365 data is not fully protected by Microsoft’s built-in retention. Exchange Online and SharePoint have limited retention periods and no user-friendly point-in-time recovery. A third-party Microsoft 365 backup (Veeam, Dropsuite, or similar) provides recoverable backups for email, OneDrive, and SharePoint.
User training. The biggest risk after a Microsoft 365 migration is staff reverting to old habits. Brief training sessions on Outlook, Teams, and OneDrive reduce the friction of the transition and improve adoption of features that deliver real productivity benefit.
Working with a Microsoft Partner
Microsoft Partners like SFS Technologies have access to migration tooling, technical training, and Microsoft support channels that accelerate complex migrations and resolve issues that would otherwise stall a self-managed project.
For Canadian businesses migrating to Microsoft 365, working with a Microsoft Partner means the migration is managed end-to-end with a clear timeline, defined deliverables, and a team that has done this before.
Book a complimentary Microsoft 365 migration assessment.
SFS Technologies is a Microsoft Partner based in Surrey, BC, providing Microsoft 365 migrations and ongoing management for businesses across Canada.
