Email Migration Services for Indian Enterprises
Exchange · Google Workspace · Zimbra → M365
Migrate your email infrastructure to Microsoft 365 with zero downtime, zero data loss, and full Indian compliance. Cutover, staged, or hybrid — we handle it end-to-end.
Why Migrate to Microsoft 365?
On-premises Exchange servers carry hidden costs — hardware refreshes every 5 years, Windows Server licensing, CALs, backup infrastructure, and dedicated admin time. A single Exchange server failure can take your entire organisation offline.
Google Workspace works for small teams but lacks enterprise security features. No native DLP, limited Conditional Access, and no integration with Active Directory-based environments that most Indian enterprises run.
Microsoft 365 gives you enterprise-grade email with built-in security (Defender for Office 365), compliance tools (retention policies, eDiscovery), and seamless integration with Active Directory, Teams, and SharePoint — all managed from a single admin console.
Risks of Staying on On-Premises Email
Exchange Server Vulnerabilities
Hafnium, ProxyLogon, ProxyShell — Exchange Server has been a top target for nation-state attackers. Patching on-prem servers is a constant race against zero-day exploits. Microsoft 365 is patched automatically.
Hidden Infrastructure Costs
Hardware refresh cycles, Windows Server + Exchange CALs, backup solutions, UPS, cooling, rack space, and a dedicated Exchange admin. These costs compound every year and are often 2-3x the visible licensing cost.
Compliance Gaps
On-prem Exchange lacks built-in DLP, eDiscovery, and retention policies that RBI and DPDPA require. Bolting on third-party compliance tools adds cost and complexity. M365 E5 includes all of these natively.
Migration Methods — Pick the Right Approach
We assess your environment and recommend the optimal method. Most enterprises use staged or hybrid.
| Method | Best For | Mailbox Limit | Downtime | Coexistence |
|---|---|---|---|---|
| Cutover Migration | Small orgs, Exchange 2013+ | < 150 | Weekend window | None — all at once |
| Staged Migration | Medium orgs, Exchange 2010/2013 | 150 – 2,000 | Per-batch (minutes) | Yes — weeks |
| Hybrid Migration | Enterprises, long-term coexist | Unlimited | Zero per mailbox | Yes — indefinite |
| IMAP Migration | Zimbra, Gmail, any IMAP server | Unlimited | DNS cutover only | Limited |
Google Workspace to Microsoft 365
Switching from Google Workspace? We migrate everything — Gmail to Exchange Online, Google Calendar to Outlook Calendar, Google Contacts to Outlook Contacts, and Google Drive to OneDrive for Business or SharePoint.
Microsoft provides a native Google Workspace migration wizard in the M365 admin centre. For large migrations (500+ users), we use BitTitan MigrationWiz for parallel migration with detailed reporting and automatic retry on failures.
Google Drive migration includes preserving folder structures, sharing permissions, and converting Google Docs/Sheets to Office formats. We handle the complexity — you just switch to Outlook.
What Gets Migrated
- Gmail mailboxes → Exchange Online mailboxes
- Google Calendar events → Outlook Calendar
- Google Contacts → Outlook Contacts
- Google Drive files → OneDrive for Business
- Shared Drives → SharePoint document libraries
- Google Sites → SharePoint sites (manual rebuild)
- Google Groups → Microsoft 365 Groups / Distribution Lists
- Labels/Filters → Outlook rules (where possible)
Post-Migration Security Hardening
Migration is only half the job. We configure Microsoft's security stack to protect your email from phishing, data leaks, and unauthorised access.
Defender for Office 365
Anti-phishing policies, Safe Links (URL rewriting), Safe Attachments (sandboxed detonation), and anti-malware filtering. We configure preset security policies tuned for Indian threat landscape.
Data Loss Prevention
DLP policies to detect and block sensitive data (Aadhaar numbers, PAN cards, bank account details) from being emailed externally. Custom DLP rules for your industry-specific data.
Conditional Access
Location-based access (block sign-ins from outside India), device compliance requirements, MFA enforcement, and session controls. Prevent lateral movement from compromised credentials.
Retention & eDiscovery
Retention policies for regulatory compliance (RBI 8-year, SEBI archiving). Litigation hold for legal matters. eDiscovery for audit and investigation. All configured during migration.
Indian Regulatory Compliance Built-In
RBI — Banking & Financial Services
- 8-year email retention policy configured in M365 Compliance Centre
- Audit logging enabled for all mailbox access and admin actions
- Data residency in India (Microsoft India South/Central regions)
- Encryption in transit (TLS 1.2+) and at rest (BitLocker + service encryption)
DPDPA — Data Protection
- Data localisation — M365 tenant with India-preferred data location
- Sensitivity labels for personal data classification
- DLP policies blocking PII exfiltration via email
- Data subject access request (DSAR) workflows via M365 Compliance
CERT-In — Incident Response
- Unified audit log for 6-hour incident reporting mandate
- Defender for Office 365 threat investigation and response
- Automated investigation and remediation (AIR) for phishing attacks
- Alert policies for suspicious login and mail forwarding rules
SEBI CSCRF — Capital Markets
- Email archiving with immutable retention (compliance lock)
- Journal rules for automatic email capture to archive mailbox
- eDiscovery for regulatory investigations and audits
- Information barriers between departments (Chinese wall compliance)
Our 6-Step Migration Process
Discovery & Assessment
Audit current mail infrastructure — mailbox count, total data volume, public folders, distribution lists, shared mailboxes, room/resource mailboxes. Identify dependencies (SMTP relays, LOB apps, MFP scanners). Document current mail flow and DNS configuration.
Tenant Setup & Identity Sync
Provision Microsoft 365 tenant, add and verify custom domains, configure Azure AD Connect for identity synchronisation, set up password hash sync or pass-through authentication, and assign licenses.
Pilot Migration
Migrate 10-20 pilot mailboxes (IT team + key stakeholders). Validate email flow, calendar sharing, mobile device access, and Outlook client configuration. Document and resolve any issues before full migration.
Full Migration
Execute batch migration during off-hours (IST evenings/weekends). Initial data sync followed by delta sync to capture last-minute changes. Migrate shared mailboxes, public folders, and distribution lists. Monitor migration health dashboard throughout.
DNS Cutover & Verification
Update MX, Autodiscover, SPF, DKIM, and DMARC DNS records. Verify mail flow in both directions. Test SMTP relay for LOB applications and MFP scanners. Confirm mobile device auto-configuration. Run item count reconciliation.
Security Hardening & Handover
Configure Defender for Office 365, DLP policies, Conditional Access, retention policies, and audit logging. Deliver compliance documentation. Provide admin training and user communication. 30-day post-migration support included.
Common Migration Scenarios We Handle
BFSI Email Compliance
Banks and NBFCs migrating from on-prem Exchange to M365 with RBI-compliant retention, archiving, and data residency in India.
Google to M365 Switch
Startups and mid-market companies moving from Google Workspace to M365 for better security, compliance, and Active Directory integration.
Zimbra Decommission
Government, education, and mid-market orgs replacing Zimbra with M365 using IMAP migration with full mailbox and calendar transfer.
Multi-Site Hybrid
Large enterprises with 2,000+ mailboxes across multiple locations running hybrid Exchange for gradual migration with zero downtime.
Why Ogma for Email Migration
Microsoft Expertise
We deploy Microsoft 365 E3 and E5 across Indian enterprises. Exchange Online, Defender for Office 365, Intune, and Azure AD are our daily working tools — not occasional projects.
Security-First Migration
Every migration includes post-migration security hardening. We configure Defender, DLP, Conditional Access, and retention policies as standard — not an upsell. Your email is more secure after migration than before.
India-Based Team
Gurugram-based team working in IST. Migration batches scheduled for Indian off-hours. On-site support available for Delhi NCR. We understand Indian compliance requirements because we operate under them.
Frequently Asked Questions
Ready to Migrate Your Email?
Get a free migration assessment. We audit your current setup, recommend the right method, and give you a fixed timeline and cost — no surprises.