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Tenant-to-Tenant Migration | MStack360
Microsoft 365 Migration Service
SOURCE
TARGET

Tenant-to-Tenant
Migration

Move your entire Microsoft 365 environment between tenants. Mailboxes, files, Teams chats. Securely, with zero data loss and minimal downtime.

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Workloads

What We Migrate

Every workload your team depends on, moved to the new tenant without losing a single item.

Exchange Mailboxes

Emails, calendars, contacts, rules, and signatures

SharePoint Sites

Team sites, document libraries, and permissions

OneDrive Files

Personal files, shared links, and folder structures

Archive Mailboxes

In-place archives and personal archives

Public Folders

Shared calendars, contacts, and folder hierarchies

Entra ID (Azure AD)

Users, groups, SID history, and UPN mapping

Intune Setup

Device policies, compliance rules, app deployments, and configuration profiles

Power Apps

Canvas and model-driven apps, connections, and data sources

Power Automate Flows

Cloud flows, scheduled flows, connectors, and shared flows

Teams Phone System

Call queues, auto attendants, policies, and number porting

Approaches

Migration Options

We choose the right method based on your environment size, budget, and timeline. Here are the three paths we work with.

Free Method

PST Export / Import

Export mailbox data to PST files and import them into the target tenant. Best for small environments or budget-sensitive projects.

  • No per-user license cost
  • Mailboxes, calendars, and contacts
  • Works for any tenant size
  • Manual process, more hands-on
Free
No license fees. Only consulting time applies.
Native Microsoft

Microsoft Orchestrator

Microsoft's own tenant-to-tenant migration tool. Handles Exchange, OneDrive, and Teams in a single workflow. Data never leaves the Microsoft cloud.

  • Unified orchestration for all workloads
  • Data stays inside the Microsoft cloud
  • Batch support up to 2,000 users
  • Built-in validation before migration
  • Requires E3/E5 plus add-on license
Per-User License
Cross-Tenant User Data Migration add-on required. GA pricing TBA.
We Recommend
Third-Party SaaS

BitTitan MigrationWiz

Industry-leading SaaS migration platform. Fully automated, supports the widest range of source and destination endpoints, and battle-tested at enterprise scale.

  • Fully automated, 100% SaaS, nothing to install
  • Mailbox, documents, archives, public folders
  • Widest source and destination support
  • Pre-stage sync for zero-downtime cutover
  • Enterprise-grade security and compliance
~$12 /user
User Migration Bundle with unlimited mailbox data. Volume discounts available.

Which one is right for you? For most tenants, we recommend BitTitan MigrationWiz because it covers the widest range of workloads and offers pre-stage syncing so your users experience zero downtime. For tenants already on E3/E5, Microsoft Orchestrator is a strong native option. PST works well for small, budget-sensitive moves.

Side by Side

Quick Comparison

A clear view of what each migration option supports, so you can pick the right fit for your environment.

Feature PST Orchestrator MigrationWiz
Exchange Mailboxes
OneDrive Files
Teams Chats and MeetingsPartial
SharePoint Sites
Public Folders
Archive Mailboxes
Pre-Stage Sync
Automation LevelManualHighFull
License CostFreeAdd-on~$12/user
Best ForSmall / BudgetE3/E5 TenantsAny Scale
Process

How the Migration Works

A structured approach from discovery to post-migration support. Here is what to expect when you work with us.

Phase 1

Discovery and Assessment

We map out your source tenant including mailbox sizes, workloads in use, compliance holds, custom domains, and any special configurations. This gives us a clear picture of what needs to move.

Phase 2

Target Tenant Setup

We prepare the destination tenant by creating user accounts, configuring domains, setting up Entra ID, and establishing the cross-tenant trust relationship needed for migration.

Phase 3

Identity Mapping and Validation

Every user in the source is mapped to their corresponding account in the target. We run a full validation pass to catch any issues such as missing licenses, compliance blocks, or mismatched UPNs before anything moves.

Phase 4

Pre-Stage Sync

Mailbox data starts syncing in the background. Users continue working on the source tenant without interruption. This dramatically reduces the cutover window.

Phase 5

Cutover and Final Sync

We schedule the cutover during off-hours. The final delta sync runs, DNS records switch, and users start working on the new tenant. Typical downtime is under 1 hour per batch.

Phase 6

Post-Migration Verification

We verify every mailbox, every file, and every chat. Users confirm access on the new tenant. We handle any edge cases and provide a migration report with a full audit trail.

Why Us

Why MStack360

We have done this before, many times. Here is what you get when you work with us on your migration.

End-to-End Ownership

We do not hand off. From discovery to post-migration support, one team handles the entire project with no gaps.

Minimal Downtime

Pre-stage syncing means most of the data moves before cutover. Your users keep working until the very last step.

Zero Data Loss

Every mailbox, file, and chat is verified after migration. We run a full audit and share the report with you.

Transparent Pricing

You know the cost before we start. License fees, consulting hours, all laid out clearly with no surprises.

Microsoft 365 Specialists

We work exclusively with Microsoft 365 including Exchange, SharePoint, Teams, and Entra ID. This is our core strength.

EST and EU Coverage

We work across Eastern Standard and European time zones, so your migration happens when it is most convenient for your team.

The Difference

MStack360 VS Alternatives

Not all migration partners are the same. Here is how MStack360 compares to the typical alternatives you will find out there.

 
Full Microsoft 365 scope
Power Platform migration
Intune and device policies
Teams Phone System setup
Pre-stage sync included
Post-migration verification
Single point of contact
Fixed, transparent pricing
EST and EU time zones
MStack360
Typical IT Firms
Partial
Sometimes
Varies
Limited

Most IT firms treat migration as "just moving mailboxes." At MStack360, we migrate your entire environment including Intune policies, Power Platform apps and flows, Teams Phone configurations, and SharePoint structures. You get a fully working tenant on the other side, not just email.

Common Questions

Frequently Asked

Straightforward answers to the questions we hear most about tenant-to-tenant migrations.

It depends on the number of users and the amount of data. A small environment with under 50 users can usually be completed within one to two weeks. Larger enterprises with hundreds or thousands of mailboxes typically take three to six weeks. The pre-stage sync runs in the background, so most of the time your users are not affected at all.
With pre-stage syncing (available in both Orchestrator and MigrationWiz), most data is transferred before the actual cutover. During the final switchover, users may experience a brief period where they need to sign in again on the new tenant. This window is typically under one hour per batch.
Microsoft Orchestrator currently migrates personal user data such as mailboxes, OneDrive, and Teams chats, but it does not migrate shared resources like Teams channels or SharePoint team sites. BitTitan MigrationWiz supports SharePoint site migrations as a separate workload. For Teams channels, a combination of tools and manual planning may be needed depending on your environment.
For PST, no migration-specific licenses are required. For Microsoft Orchestrator, both tenants need Microsoft 365 E3 or E5, plus a Cross-Tenant User Data Migration add-on license per user. For BitTitan MigrationWiz, you purchase a per-user license (starting around $12 per user for the User Migration Bundle). We help you determine the most cost-effective licensing approach during the assessment phase.
Mailboxes under any type of legal or compliance hold (such as eDiscovery holds) cannot be migrated until those holds are released. During the discovery phase, we identify all held mailboxes and work with your legal and compliance teams to determine the best way forward before the migration begins.
Yes. Domain cutover is a critical part of every migration project. We coordinate the removal of the domain from the source tenant, the DNS record updates, and the re-verification of the domain on the target tenant. We schedule this carefully to minimize the impact on mail flow.
MigrationWiz supports the widest range of workloads including mailboxes, documents, archives, public folders, and SharePoint sites in a single platform. It offers pre-stage syncing for near-zero downtime cutovers, works at any scale, and does not require specific Microsoft license tiers. That said, if you are already on E3/E5 and only need to move mailboxes, OneDrive, and Teams, the Microsoft Orchestrator is also a solid choice. We always recommend the option that fits your specific situation.

Ready to Move Your Tenant?

Book a free migration assessment. We will review your environment, recommend the right approach, and give you a clear timeline and cost estimate.

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