TLDR
Still relying on a shared hosting email account for your business? If your email goes down, your business stops. This guide walks you through exactly what a migration to Microsoft 365 involves such as timelines, costs, risks, and what to watch out for. This guide is written for business owners, not for IT engineers.
Why Tbourke Solutions Wrote This Guide
Most email migration guides focus on technical steps. They assume the reader is a systems administrator or an engineer who already understands DNS, mail flow, connectors, and authentication.
This leaves business owners confused and often nervous about what a migration will involve. A lack of clear, high level guidance can delay important decisions and lead to unnecessary fear about downtime or data loss.
Tbourke Solutions has been supporting small and medium businesses for more than twenty years. Our team specialises in modern cloud solutions, cybersecurity, proactive monitoring, and fast friendly support delivered by local technicians. We have completed hundreds of migrations from shared hosting, cPanel, custom servers, Google Workspace, and legacy platforms into Microsoft 365.
This guide translates that experience into something that business owners, IT managers, administrators, and general users can understand without needing to become experts first.
Why So Many Businesses Move to Microsoft 365
Microsoft 365 is more than an email platform. It is a complete productivity and security ecosystem. Businesses typically move away from shared hosting or older mail servers because of several key advantages.
Improved Security
Microsoft 365 includes features like multi factor authentication, conditional access, and threat protection. These significantly reduce the risk of email compromise, password attacks, and phishing attempts.
Increased Reliability and Uptime
Shared hosting environments often struggle with performance or server limits. Microsoft’s cloud infrastructure delivers consistent uptime for organisations of all sizes.
Scalability and Flexibility
Adding new users, creating shared mailboxes, or integrating mobile devices becomes much simpler. There is no server hardware to maintain or upgrade.
Better Collaboration Tools
Email is only the beginning. Once migrated, businesses can also take advantage of Teams, SharePoint, OneDrive, Planner, and advanced conferencing.
To help you understand the advantages of Teams, we have a good guide on Microsoft Teams for Businesses.
Lower Long Term Cost
While licensing costs may appear higher at first glance, Microsoft 365 often reduces the need for multiple third party tools, local server hardware, and ongoing maintenance.
The Full Email Migration Process Explained Clearly
Migrating email may seem simple on the surface. In reality, several moving parts must be accounted for to avoid downtime or data loss. Below is a clear step by step overview written with business decision makers in mind.
1. The Discovery Phase
The discovery phase is the foundation of a successful migration. Skipping it can result in unexpected surprises during cutover.
Tbourke Solutions completes a full discovery audit that includes:
A full list of mailboxes, aliases, shared addresses, forwarding rules and distribution groups
An inventory of DNS providers, domain owners, and administrative access
A review of devices that send emails, including printers, scanners, VoIP systems, CCTV, alarm panels, CRM platforms and custom software
A security evaluation to identify vulnerabilities that may need addressing during or after the migration
Checks for mailbox size, retention requirements, and legal compliance needs
This phase ensures that every part of the business that touches email continues working after the migration.
2. Planning the Migration in Detail
Once discovery is complete, a tailored migration plan is created. This plan outlines:
- The exact approach, whether using the Microsoft Migration Wizard, BitTitan, SkyKick, or a hybrid method. For businesses running an existing on-premise Exchange environment, see our guide on Exchange Server hybrid deployment
Which mailboxes will be pre seeded and when final synchronisation will occur
A user communication timeline so staff know what to expect
The role of the internal IT professional if the client has one
Expected downtime windows and how they will be minimised
Costs for licensing, labour, optional tooling and onboarding support
A rollback plan for safety and confidence
A well structured plan reduces friction and makes the migration predictable for everyone involved.
3. Pre Seeding Mailboxes
Pre seeding is where the bulk of email data is copied to Microsoft 365 before the actual cutover. Users continue working on their old email system until cutover day.
Advantages include:
Almost no downtime
Minimal disruption for staff
Reduced pressure during cutover
Faster switch over times
Lower risk of errors
Tbourke Solutions uses Microsoft’s Migration Wizard for most scenarios. It is reliable, cost-effective, and ideal for shared hosting or cPanel environments. For more complex migrations, we use BitTitan or SkyKick depending on the situation.
4. User Acceptance Testing. A Key Quality Step
Testing is not optional. It is vital. Before cutover, a selection of users participates in a User Acceptance Testing stage where they check:
Outlook on desktop and mobile
Shared mailboxes and permissions
Calendar sharing
Internal communication tools
App or device based SMTP sending
This gives the business real confidence that their environment works as expected before the final transition.
5. Cutover and Final Synchronisation
Cutover is the moment when mail flow switches to Microsoft 365. DNS changes are applied, and the final delta sync takes place.
Tbourke Solutions coordinates:
DNS updates
Profile refreshes for users
Mobile re configuration
Verification of mail flow
Validation of devices sending mail
Most businesses experience little to no downtime because the heavy lifting was done during pre seeding.
6. Post Migration Support and Optimisation
After the cutover, support continues until everything is stable. Tbourke Solutions ensures:
Staff receive help updating email signatures, profiles and mobile setups
Security features like MFA and conditional access are enabled
Backups and retention policies are configured
The business understands how to use Teams, OneDrive and SharePoint
Performance checks and mailbox verifications are completed
A migration is not finished at cutover. It is finished when the business is fully comfortable with their new environment.
Real World Case Studies From Tbourke Solutions
Case Study. Migrating 30 Mailboxes From a Shared Host in Under One Week
A Melbourne-based medical specialists with three locations needed to urgently move thirty mailboxes from a shared hosting provider to Microsoft 365. They had an in house IT professional who was familiar with their email systems.
What We Did
Completed discovery and verified all devices that relied on email
Used pre seeding to copy all mailboxes to Microsoft 365 before cutover
Provided clear documentation for their internal IT staff
Performed a cutover with minimal disruption
Result
The full migration, including training, was completed in less than a week
Costs were significantly lower because internal IT performed some onsite tasks
Staff experienced no downtime
This hybrid model is ideal for businesses that want professional oversight with collaborative involvement.
Case Study. Overcoming Google Apps Label Complications
A Melbourne professional services firm migrating from Google Workspace ran into a common but costly problem. Google Workspace uses labels instead of folders, and during migrations this can cause duplication. In some cases mailboxes can double or triple in size if not handled properly. The full migration was completed in under two weeks with zero data loss.
Challenges
Duplicated emails due to multiple labels per message
Very large mailboxes that slowed down migration
Confusion about folder structure once imported into Outlook
Our Approach
Audited labels and removed unnecessary categories before migration
Applied filters to prevent duplication during sync
Ran post migration optimisation scripts
Provided clear training to help users adapt to the folder based Outlook structure
Outcome
Mailboxes were clean and streamlined
No long term performance issues
Users reported improved clarity and organisation
Common Misconceptions Businesses Have About Email Migrations
“It’s just email. It should be quick.”
Email is tied into printers, apps, logins, forwarding rules, DNS records and often multiple providers. A quality migration is more than a mailbox copy. It is a business wide change.
“We can skip user training.”
Training boosts productivity and reduces support tickets. Even experienced users benefit from learning the new Microsoft 365 features.
“Shared mailboxes are free so there is no cost.”
Shared mailboxes do not require licences. but users accessing them need valid licences. Misunderstanding this can cause unexpected issues at cutover.
Security Enhancements After Migration
Once the business is running on Microsoft 365, several security improvements can be enabled. Our managed cybersecurity services team can implement all of these as part of your post migration setup. You may also want to read our guide on preventing phishing attacks.
Multi factor authentication
Conditional access rules
Advanced threat protection
Improved spam filtering
Geo blocking
DKIM, DMARC and SPF alignment
Microsoft Secure Score reporting
Backup and retention controls
The migration is a perfect time to modernise security and bring systems up to best practice standards.
What Email Migrations Typically Cost
Costs vary depending on mailbox size, complexity and tooling. A standard cost model includes:
Licensing
Microsoft 365 Business Basic, Standard or Premium depending on the features required.
Labour
Discovery and environment audit
Planning and communication
Pre seeding and migration
Cutover
Training and post migration support
Optional Tools
Some migrations benefit from third party tools where advanced options are needed.
Providing businesses with transparent pricing upfront helps them make informed decisions without surprises.
We provide transparent fixed-price quotes upfront.
Email Migration Checklist for Moving to Microsoft 365
1. Pre Migration Discovery
Confirm domain ownership and DNS access
List all mailboxes, aliases, shared mailboxes and groups
Collect mailbox sizes and identify oversized accounts
Document forwarding rules and distribution lists
Audit printers, scanners, VoIP systems and apps using SMTP
Identify any third party mail filtering or security gateways
Review security requirements and compliance needs
Confirm availability of internal IT support if applicable
2. Planning
Choose the migration method
Set timelines for pre seeding and cutover
Prepare a communication plan for staff
Identify pilot users for testing
Create rollback procedures
Decide on Microsoft 365 licence types
Document expected downtime windows
3. Pre Seeding
Configure migration endpoints
Start initial synchronisation of all mailboxes
Monitor sync progress and track any errors
Verify mailbox structure and label or folder compatibility
Prepare new profiles for Outlook if required
4. User Acceptance Testing
Test Outlook access on desktop and mobile
Confirm calendar sharing
Check shared mailboxes and permissions
Test line of business apps and SMTP devices
Ensure users can send and receive without issues
5. Cutover
Apply DNS changes
Perform final delta sync
Re configure profiles on desktops and mobile devices
Verify mail flow to and from external recipients
Check shared mailboxes and distribution groups
6. Post Migration
Enable MFA and conditional access
Configure retention policies and security baselines
Set up mobile device management if required
Provide staff training for Outlook, Teams and OneDrive
Remove old mail services and decommission legacy systems
Complete backup or archiving configuration
Frequently Asked Questions
How long does an email migration to Microsoft 365 take?
Most small business migrations of 10 to 30 mailboxes are completed within one to two weeks. Larger or more complex environments may take three to four weeks. The timeline depends on mailbox size, the number of devices involved, and whether pre seeding is used to minimise downtime.
Will my staff experience downtime during the migration?
With proper planning and pre seeding, most businesses experience little to no downtime. Staff continue using their existing email right up until cutover, which typically takes place outside business hours.
What happens to my old emails after migration?
All existing emails, folders, contacts and calendar items are migrated across to Microsoft 365. Nothing is deleted from your old environment until you confirm everything has transferred correctly and you are ready to decommission it.
How much does an email migration to Microsoft 365 cost in Australia?
Costs vary depending on the number of mailboxes, complexity and tooling required. Most small business migrations fall within a predictable range. Tbourke Solutions provides transparent fixed price quotes upfront after a free discovery audit so there are no surprises.
Can I migrate from Google Workspace to Microsoft 365?
Yes. Tbourke Solutions has completed many Google Workspace to Microsoft 365 migrations. The main complexity involves Google’s label system which can cause mailbox duplication if not handled correctly. Our team manages this process carefully to ensure clean, accurate results.
Final Thoughts
Migrating to Microsoft 365 offers long term security, flexibility and productivity benefits. With careful planning, expert support and a structured approach, the process can be smooth and cost effective. Tbourke Solutions has been supporting Melbourne businesses for more than twenty years and understands the practical challenges that migrations create. Our proven approach ensures minimal downtime and maximum value.
If you’re a Melbourne business looking for expert support with your migration, our managed IT services in Melbourne team handles the entire process end to end — from discovery through to post migration support.
Book us for a migration assessment or visit our contact page. We can review your environment, create a tailored migration plan, provide transparent pricing and guide you every step of the way.
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