Microsoft 365 Migration Services from Google Workspace, Exchange & Other Tenants
Email is the one system every person in the company uses every hour, which is why a migration done casually is remembered for years. NetSys runs Microsoft 365 migration services in a fixed order: identities first, a coexistence period where both systems deliver mail, a rehearsed cutover, and a first week where an engineer is watching the queues instead of waiting for complaints.
The short answer
Microsoft 365 migration services move agreed email, calendar, contact and file data from Google Workspace, Exchange or another source into a prepared tenant. A Google Workspace to Microsoft 365 migration also needs decisions about shared drives, Google-native files, permissions, user identities and applications that send mail. NetSys scopes the source data and exceptions first, pilots the transfer, plans cutover and validates the result with business owners. Source retention, rollback options and post-migration support should be agreed before the move.
The decision to move usually arrives with a deadline: an Exchange server going out of support, a Google Workspace renewal, or two firms combining and needing one address book. The migration itself is well understood. What separates a clean one from a painful one is the planning around it, especially how mail is delivered during the days when some users are on the old system and some on the new.
We have run these for law offices in Brooklyn, importers in Nassau County and healthcare groups in Westchester. Secure the destination before it receives data. Copy history while the source is live so the cutover moves only the last few hours. Keep the old system readable for a month afterward. Latoya Reed's Microsoft 365 team leads the technical work.
Coexistence First, Cutover Once
We build the tenant to a security baseline (MFA, conditional access, Defender policies, backup) before a single mailbox moves. Historical mail and files are copied in the background over days or weeks with the source system untouched. Coexistence keeps calendars and mail routing working across both platforms for firms that cut over in stages. The final cutover changes MX records on a quiet evening, moves the last delta, and reconfigures Outlook and mobile devices through Intune, with a written rollback plan.
What Microsoft 365 Migration Services Cover
From Google Workspace
Gmail, Drive and Calendar into Exchange, OneDrive and SharePoint.
- Mailbox, label and calendar migration with Google labels mapped to Outlook folders
- Shared drives and My Drive moved into SharePoint and OneDrive with permissions reviewed
- Google Groups recreated as Microsoft 365 groups, distribution lists or shared mailboxes
- Chat and Meet replaced with Teams, with training that covers the differences people notice first
From On-Premises Exchange
Retire the server without losing a message.
- Hybrid, cutover or staged migration chosen by mailbox count and how long coexistence must last
- Public folders, shared mailboxes and archives handled as their own workstreams
- Directory synchronization set up so passwords and groups stay consistent during the move
- Exchange server decommissioned safely after the last mailbox and the last connector are moved
Tenant-to-Tenant Moves
Mergers, acquisitions and divestitures without two address books.
- Domain transfer planning, because a domain can live in only one tenant at a time
- Mailbox, OneDrive, SharePoint and Teams migration between tenants in scheduled waves
- Licensing consolidation and duplicate-account cleanup before the move
- Conditional access and security policy reconciled so the combined firm has one standard
Cutover & First Week
The change happens once, on purpose, with people watching.
- Cutover runbook with DNS timing, delta sync, device reconfiguration and rollback steps
- Outlook profiles and mobile mail reconfigured through Intune rather than desk by desk
- Help desk staffed for cutover week, with the most common questions answered before they are asked
- Old system kept readable for an agreed period, then retired with data confirmed in backup
Why Businesses Choose NetSys for Microsoft 365 Migration
Fifteen minutes with a NetSys engineer, not a salesperson, and you will know where your microsoft 365 migration stands and what it would take to fix it. Call 845-203-3914 or request a call to discuss the scope and next steps.
Who does the work: meet the NetSys team on our About page.
- The destination tenant is secured before it holds your data, not after the first phishing email
- History is copied while the old system stays live, so cutover moves hours of mail, not years
- Every migration has a written runbook and a rollback plan you can read before the weekend
- The engineers who move the mail are the ones who answer the help desk on Monday
- Ongoing Microsoft 365 management is included in a month-to-month agreement
Microsoft 365 Migration in practice
- Importers and distributors
Wholesale medical supply distributor
Microsoft 365 migration for 68 users, SharePoint organization of 1.5 TB of business files, email protection, and ongoing IT support.
SharePoint & OneDrive MigrationIT for Importers and Distributors
Client names are withheld. Each card is the scope of a real NetSys engagement, as delivered.
Where we deliver Microsoft 365 Migration
Microsoft 365 Migration in New York City · Microsoft 365 Migration in Westchester County · Microsoft 365 Migration in New Jersey · Microsoft 365 Migration in Tampa Bay. We also support clients remotely wherever their systems run. See all locations and service areas.
Microsoft 365 Migration FAQs
What is a Microsoft 365 migration?
It is the move of mail, calendars, contacts, files and user identities from another system into Microsoft 365: Google Workspace, an on-premises Exchange server, a hosted or IMAP mail service, or another Microsoft 365 tenant. Microsoft provides the main tools: Exchange Online migrations for cutover, staged, hybrid, IMAP and Google Workspace moves, Migration Manager for files in Google Drive, Box or Dropbox, and cross-tenant migration between tenants. Which method fits depends on the source, the number of mailboxes and how long both systems must run side by side.
How long does a Microsoft 365 migration take?
Small firms with clean data typically go from kickoff to cutover in a few weeks. Larger mailboxes, public folders, an aging Exchange server or a tenant-to-tenant merger add time because each is its own workstream. We give a dated plan after the assessment, and the cutover is scheduled for an evening or weekend the business chooses.
Will we lose email during the migration?
No, if the migration is sequenced correctly. Historical mail is copied while the old system is still receiving. At cutover, DNS is changed to deliver to Microsoft 365 and a final delta copies anything that arrived in between. The old system stays readable for an agreed period as a safety net. The risk of loss comes from migrations that flip DNS first and copy later, which is the order we do not use.
Can we migrate from Google Workspace to Microsoft 365 without disrupting the office?
We plan to reduce disruption through pilot users, staged copies and an agreed cutover window. Google-native files, shared drives, permissions, calendars and third-party integrations need separate review because they do not all map one-to-one into Microsoft 365. Users also need help with sign-in, Outlook and where files will live. The plan should state expected interruptions and unresolved exceptions before cutover; zero disruption is not a blanket promise.
What is coexistence in a Microsoft 365 migration?
Coexistence is the period when both systems are live and mail, calendar availability and the address book work across them. It matters for firms that move in stages, such as one office or department at a time, or that need a hybrid Exchange setup while a server is retired slowly. We configure routing and free/busy sharing so a user on the old system can still schedule a meeting with one who has moved.
Do we need Microsoft 365 migration services if we are already on Microsoft 365?
You might, in two situations. A merger or acquisition leaves two tenants that need to become one, which is a tenant-to-tenant migration with its own rules about domains and licensing. Or the current tenant was set up badly, with shared passwords, no MFA and files in personal OneDrives, and a rebuild into a clean tenant is faster than repairing it.
What does a Microsoft 365 migration cost?
Cost depends on source platform, users, data volume, tenant complexity, permissions, integrations and support during cutover. Ask whether discovery, migration tooling, destination licensing, file conversion, validation and post-move help are included. NetSys scopes the project before quoting; ongoing tenant management is a separate service decision.
What is included in your Microsoft 365 migration services?
An assessment of the source (users, mailbox sizes, shared drives, DNS and the applications that send mail), the destination tenant secured to a baseline before it holds data, identities and directory synchronization, mail, calendars, contacts and files copied in the background, groups and shared mailboxes recreated, coexistence where the move is staged, a cutover runbook with a written rollback plan, Outlook and mobile profiles reconfigured through Intune, a help desk staffed for cutover week, and the old system kept readable for an agreed period.
How does a Microsoft 365 migration start?
With the assessment: a list of users and mailbox sizes, the shared drives and their owners, the DNS records, and every scanner, application and website form that sends mail through the old system. From that we choose the migration method, secure the destination tenant and pick the pilot users whose mail and files move first. The dated plan and the cutover window are agreed before the bulk copy starts.
Who supports staff during and after cutover?
The engineers who moved the mail. The help desk is staffed for cutover week with the common questions answered in advance; it is open seven days a week from 4 a.m. to 11 p.m. Eastern time, and emergency service is available 24/7 if mail stops flowing. After the first week the tenant moves into Microsoft 365 management under the month-to-month agreement, or, if you prefer, to your own IT staff with the runbook and documentation.
Guides on this topic
- Scope a focused business email migration
- Already on Microsoft 365? Plan a tenant merger or split instead of platform adoption
- Plan file structure and permissions in SharePoint
- Arrange Microsoft 365 support after migration
- Set recovery protection for the destination tenant
- Microsoft 365 vs Google Workspace: Small Business
- Cloud Migration for Small Business: 8 Questions Answered
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- Phoenix IT consulting services
- Microsoft 365 migration cost drivers
- Microsoft 365 Business Basic vs Standard for the destination tenant
- Tenant-to-tenant migration questions answered
- Moving from Google Workspace to Microsoft 365: A Migration Guide
Define the cutover before moving the first mailbox.
Bring the source platform, user count, approximate data size and deadline. We will identify permissions, integrations, pilot users and cutover support that belong in the migration scope.