Google Workspace to Microsoft 365 Migration
Gmail → Outlook. Drive → OneDrive. Shared Drives → SharePoint. Meet → Teams. From $15/user. Coexistence lets users work in both during transition. 0 data loss, fixed-fee SOW.
BitTitan Certified · Zero Data Loss · Microsoft Partner
Every Gmail. Every Drive. Every Shared Drive.
What actually moves across.
Google Docs, Sheets, Slides auto-convert to Word, Excel, PowerPoint. Most formulas have direct Excel equivalents. Apps Script and Google-only functions (IMPORTRANGE, GOOGLEFINANCE) get manual audit and Power Automate rewrites.
Standard migration handles up to 250 GB per user in Google Drive. Over that, Premium package adds archive strategy and phased Shared Drive migration to SharePoint document libraries.
Users can work in both Gmail and Outlook during transition. Calendar free/busy syncs across platforms. Gives power users time to adapt before Google Workspace is decommissioned.
Domain stays yours, addresses stay the same. Only MX + SPF + DKIM + Autodiscover change. Recipients notice nothing. Migration tool runs delta sync up to the minute of DNS cutover.
Every workload. Mapped cleanly.
Gmail → Exchange Online
Emails, labels (converted to folders with categories), signatures, filters (translated to Outlook rules). BitTitan MigrationWiz runs incremental sync until DNS cutover — zero downtime.
Drive → OneDrive
Personal Drive files to OneDrive for Business. Folder structure, sharing permissions, and version history preserved. Google Docs auto-convert to Word, Sheets to Excel, Slides to PowerPoint.
Shared Drives → SharePoint
Google Shared Drives map to SharePoint Online document libraries. Site permissions recreated with Entra ID groups. Team Drives become proper modern SharePoint sites.
Calendar + Contacts
Calendar events (including recurring, exceptions, attachments), free/busy, shared calendars, and global contacts. Room and resource calendars rebuilt as Exchange resource mailboxes.
Meet → Teams + Chat
Microsoft Teams provisioning, team/channel setup, policies, retention. Google Chat history exported to downloadable archive — Teams private chats start fresh by design.
DNS + security cutover
MX, SPF, DKIM, DMARC, Autodiscover tested and flipped off-hours. Entra ID, MFA, Conditional Access, and Intune baseline deployed before day one. Tenant is production-ready.
Four phases. Zero surprises.
Assess
1-3 days · User count, Drive size, Shared Drives audit, Apps Script review, fixed-price SOW in 3-5 business days.
Plan
3-5 days · M365 tenant provisioned, domain verified, coexistence configured, security baseline (MFA, Conditional Access) deployed.
Pilot
1-2 days · 10-20 pilot users migrated first. Validate Outlook, OneDrive sync, Teams, mobile devices. Fix every issue before the full wave.
Cutover
1-5 days · Wave migration, delta sync captures late changes, DNS flip off-hours. 7-30 days hypercare covers Outlook profiles, OneDrive sync, user questions.
The engineers on your project.
No outsourced ticket triage. The same three engineers run your assessment, your cutover, and your hypercare. You will know their names and direct contact.
Sreenivasa Reddy
Founder & Principal Migration Engineer
MCSE Messaging · 25 yrs · 500+ migrations led
Owns the architecture call on every multi-country GW→M365 engagement. License SKU strategy, storage tier planning, and the >100 GB mailbox decisions all route through him. Direct contact for enterprise SOW conversations.
Roshan Pujari
Senior Migration Engineer · GW→M365 Lead
Microsoft Certified · M365 Administrator
Runs the Google Workspace discovery: license inventory across both tenants, MDM/Intune posture, OU/group mapping, Apps Script audit, Shared Drive structure assessment. The specific person who picks up your project from the assessment phase forward.
Bhargav
Senior Migration Engineer · Mail Flow + Cutover
Microsoft Certified · Exchange + M365 Messaging
MX/SPF/DKIM/DMARC cutover, post-cutover Outlook profile + mobile resync, delta sync windows. Owns the 2–4 hour DNS flip moment that makes or breaks a clean migration.
Three engagements. Three different shapes.
Anonymized. Scope → challenge → fix → outcome. The kind of operational detail you need to evaluate whether we can handle yours.
Financial Services / Trading · 167 mailboxes · 9 countries · 4.14 PB · Google Workspace → Microsoft 365
Two parallel tenants, 9-country footprint, mid-flight license restructure
Scope
Existing M365 tenant (1,242 users, Entra ID, Intune-managed, Microsoft 365 Apps for Business + a few E3/E5/Copilot reservations). Parallel Google Workspace tenant with 848 user objects, 167 active mailboxes, 11.1 TB personal/shared storage, 4.14 PB across 93 Google Shared Drives. Footprint: Melbourne HQ, Vietnam, Thailand, Bulgaria, Guatemala, Cyprus, UAE, Philippines, UK, plus regional offices in Malaysia, Mongolia, Bangladesh.
Challenge
Several mailboxes exceeded the M365 100 GB primary limit, requiring per-mailbox strategy decisions. License model had to be restructured before cutover (Purview + Defender for Cloud Apps tenant-wide; right-sizing Apps Business vs Standard vs E3/E5). Compliance-driven retention requirements meant Online Archive alone wasn't sufficient. Multi-region cutover needed time-zone follow-the-sun coverage.
Fix
Pre-migration: full license SKU restructure (added Purview org-wide, Defender for Cloud Apps, kept E3/E5 reservations for compliance leadership). Storage strategy per >100 GB mailbox decided case-by-case (PST export for older retention, third-party archiving for compliance-sensitive accounts, phased Online Archive for current). Senior engineer placed on-site at Melbourne HQ during cutover window. Bangalore + Wyoming offices covered the off-Australia cutover hours. Microsoft Teams was NOT in scope — customer kept Zoom for UC; we provisioned Teams only as a side-effect of M365 baseline.
Outcome
167 mailboxes migrated cleanly. Zero permanent data loss. License restructure in place before cutover so post-migration ops were on the right SKU mix from day one. 4.14 PB shared drive data remained on Google Workspace as archive (not all migrated — strategic decision to keep historical data in source for cost reasons).
Real Estate Services · ~85 users · Single state · Google Workspace → Microsoft 365
Office-centric SMB cutover with full PC re-onboarding
Scope
Mid-size real estate brokerage in Georgia, USA. ~85 user mailboxes on Google Workspace. Heavy Google Drive use for transaction documents (contracts, MLS exports, closing packets). Mobile-first agents needed Outlook + OneDrive working on iOS/Android day one of cutover.
Challenge
Customer had no internal IT — needed everything handled, including PC re-onboarding for office-based staff. Google Drive folder structure was deeply nested with shared-with-individual permissions throughout (not Shared Drives). Needed to convert that into a clean SharePoint structure without breaking team collaboration.
Fix
Standard 4-phase delivery (Assess, Plan, Pilot, Cutover). 10-user pilot wave validated mobile setup before mass cutover. Drive→OneDrive for personal files; redesigned folder structure into 4 SharePoint sites (Listings, Transactions, Marketing, Operations) with proper M365 group-based permissions. PC re-onboarding included for all office staff during hypercare week.
Outcome
85 users on M365 with proper SharePoint information architecture (not just a flat OneDrive dump). Mobile devices working day one. No closing transactions disrupted during the cutover week.
Healthcare / HIPAA-regulated · ~120 mailboxes · Google Workspace → Microsoft 365 (HIPAA-compliant)
BAA-required migration with PHI in email + Drive
Scope
Multi-clinic healthcare provider on Google Workspace Business Plus. Patient health information (PHI) in email body, attachments, and Drive folders. Required signed BAA (Business Associate Agreement) with Microsoft and full audit trail of every data movement.
Challenge
PHI handling required encryption-in-transit + at-rest verification on every transfer. Audit log had to capture every mailbox + file with timestamp, source, destination, integrity hash. Sensitivity labels needed to be configured BEFORE migration to auto-classify PHI on arrival.
Fix
Pre-migration: M365 tenant configured for HIPAA (BAA in place, sensitivity labels deployed via Microsoft Purview, Conditional Access for PHI-classified content, audit log retention extended). Migration ran with SHA-256 verification on every item, full audit log captured. Post-migration validation included sample PHI item verification by their compliance officer.
Outcome
Full migration completed under HIPAA-compliant controls. Audit reports delivered to customer's compliance officer. Sensitivity labels auto-applying to PHI-classified content from day one.
The GW-specific things we plan for.
Generic M365 migration guides skip these. They are the operational decisions that separate a clean cutover from a Monday-morning disaster.
Google pooled storage vs M365 separated storage
Google Workspace gives you ONE storage pool shared across Gmail, Drive, Photos. M365 separates storage into Primary Mailbox (50/100 GB hard cap), Online Archive (100 GB→1.5 TB auto-grow over time), OneDrive (1-2 TB/user), SharePoint (tenant pool). Migration planning has to map the source pool into the right destination tier.
Gmail labels → Outlook folders (multi-label gotcha)
Gmail allows ONE email to have multiple labels. Outlook uses single-folder structure. We map the primary label to a folder and preserve other labels as Outlook categories. We review your label structure before migration to flag any messy multi-labeled threads.
Google Docs/Sheets/Slides auto-conversion
Native Google formats convert to .docx / .xlsx / .pptx during Drive→OneDrive migration. Most formulas have direct Excel equivalents. Apps Script and Google-only functions (IMPORTRANGE, GOOGLEFINANCE, IMPORTHTML, IMPORTXML) get manually audited and rewritten as Power Automate flows or Office Scripts where business-critical.
Shared Drives → SharePoint sites (not document libraries)
Google Shared Drives map best to dedicated SharePoint sites (one per Shared Drive), NOT to document libraries within an existing site. This preserves the team-membership boundary and lets us recreate Drive permissions as M365 group memberships.
Google Vault retention → Microsoft Purview
Google Vault holds-and-search policies don't auto-port. We configure Microsoft Purview (eDiscovery, retention policies, sensitivity labels) before cutover to match the source retention model. For HIPAA / compliance-driven orgs this is non-negotiable, scheduled in the Plan phase.
License SKU restructure before cutover
Most GW→M365 migrations need a license rethink. Google Business Plus seats don't map 1:1 to a single M365 SKU. Common pattern: a few E5 seats for compliance leadership + Business Standard for the rest + Microsoft Purview tenant-wide + Defender for Cloud Apps if you handle sensitive data. We restructure BEFORE cutover so post-migration you're not paying for the wrong mix.
Frequently Asked Questions
How do you migrate Gmail to Outlook in Microsoft 365?+
Can you migrate Google Drive files to OneDrive and SharePoint?+
Do Gmail labels convert to Outlook folders?+
Can users keep their email addresses after migrating from Google Workspace?+
How long does a Google Workspace to Microsoft 365 migration take?+
How much does a Google Workspace to Microsoft 365 migration cost?+
What if our Google mailboxes are over 100 GB? M365 has a hard limit there.+
Can you handle multi-country tenants and on-site cutover support?+
Should we restructure our M365 licenses before or during the migration?+
What happens to Google Apps Script automations and IMPORTRANGE/GOOGLEFINANCE formulas?+
Can you do a HIPAA-compliant Google Workspace to M365 migration?+
Leave Google. Land clean.
Coexistence during migration. Zero data loss. Fixed-fee SOW from $15/user. 30 days hypercare.
Microsoft Solutions Partner · BitTitan certified · Fixed-fee SOW · 30 days hypercare
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