The practical Office to M365 migration India guide your IT team actually needs
Table of contents
- What “migration” actually means (and what it does not)
- Why Indian companies are moving now
- The 7-phase migration plan we use for every client
- Licence math: which M365 plan saves you money
- The 4 mistakes that cause data loss during migration
- Neha’s take
- FAQ
What “migration” actually means (and what it does not)
An Office to M365 migration India project moves your company from perpetual Office licences (Office 2016, 2019, or 2021 installed on individual machines) to a Microsoft 365 cloud subscription. That means your Word, Excel, and Outlook apps stay, but you also get Exchange Online, OneDrive, SharePoint, and Teams. It does not mean you lose your existing files. Every .docx, .xlsx, and .pptx on local drives stays exactly where it is until you choose to move it.
I migrated 14 Indian companies between January and March this year. The number one fear in every kickoff call was “will we lose our files?” The answer, every time, was no. Migration copies data. It does not delete originals. Your rollback window stays open for approx 30 days minimum.
The real question is not whether migration is safe. It is whether your current setup is safe. Perpetual licences stopped getting security patches once mainstream support ended. Office 2016 has been out of mainstream support since October 2020. Office 2019 drops off in October 2025. If you are reading this on a machine running either, you are already exposed.
Why Indian companies are moving now
Three things changed in the last approx 18 months that made “we will do it next quarter” a bad strategy.
First, the DPDP Act 2023 raised the stakes on data handling. Microsoft 365 Business Premium includes Intune, Conditional Access, and DLP policies that directly address DPDP requirements. Perpetual Office gives you none of that. Second, Microsoft stopped selling new perpetual volume licences to most SMB customers in India. The procurement path is shrinking. Third, the per-user-per-month model actually costs less than buying new perpetual licences every approx 3-4 years once you factor in Exchange hosting, antivirus, and backup that M365 bundles in.
I ran the numbers for a 120-person logistics company in Pune last quarter. They were paying ₹1.1 lakh per year for third-party email hosting, ₹48,000 for antivirus, and ₹72,000 for cloud backup. That is ₹2.3 lakh per year on top of their perpetual licences. Microsoft 365 Business Basic at ₹150/user/month would have cost them ₹2.16 lakh per year, and it includes email, 1 TB OneDrive, and Teams. The desktop apps were not even in that comparison. Bump to Business Standard at ₹660/user/month for full desktop apps and the total is ₹9.5 lakh, but you drop the perpetual licence renewal, email hosting, backup, and antivirus lines entirely.
If you are still weighing why M365 wins for Indian businesses, read our comparison first. This guide assumes you have already decided to move.
The 7-phase migration plan we use for every client
This is the actual plan we run. Not a theoretical framework. We have run it 80+ times, refined it after every engagement, and the average completion time is approx 3-4 weeks for companies with approx 50-300 users.
Phase 1: Audit (days 1-2). Inventory every machine, Office version, mailbox size, PST file location, shared drive structure, and third-party add-ins. We use a spreadsheet. Nothing fancy. The output is a migration scope document that lists every user, their data footprint, and any blockers (macros, Access databases, COM add-ins that will not work in cloud).
Phase 2: Licence selection (day 3). Map each user role to an M365 plan. Not everyone needs the same SKU. The reception desk does not need Business Premium. The finance team probably does. See the licence math section below.
Phase 3: Tenant setup (days 3-5). Provision the Microsoft 365 tenant, verify the domain, set up DNS records (MX, autodiscover, SPF, DKIM, DMARC), configure security defaults, and enable MFA. This is where most DIY migrations go wrong. A misconfigured MX record means email stops flowing. We run a parallel mail flow for approx 48 hours before cutting over.
Phase 4: Pilot group (days 6-10). Migrate approx 5-10 users first. Pick people from different departments. Move their mailboxes, sync their OneDrive, install desktop apps. Watch for breakage. Fix it before the rest of the company moves.
Phase 5: Bulk migration (days 11-18). Move everyone else in batches of 20-30 users per night. Mailbox migration runs overnight using the Microsoft migration endpoint. OneDrive sync installs via Intune or manual push. Desktop apps deploy via the Office Deployment Tool or Intune.
Phase 6: Decommission (days 19-25). Remove old email server (or cancel third-party hosting). Redirect any remaining MX fallback. Archive PST files. Uninstall old Office versions. This is also when you retire licences from the volume licensing portal.
Phase 7: Adoption check (days 26-30). Are people actually using Teams? Is OneDrive sync running on every machine? Are shared drives migrated to SharePoint? We run a 30-day adoption check and flag any user still working from local files only.
The whole process takes approx 3-4 weeks. Larger companies (approx 300-500 users) stretch to approx 5-6 weeks because batch sizes need to be smaller to avoid network saturation in Indian offices where bandwidth is still 50-100 Mbps symmetrical at best.
Licence math: which M365 plan saves you money
Every M365 migration starts with the wrong question: “How much does M365 cost?” The right question: “How much are you spending now on things M365 replaces?”
Here is the comparison I run for every prospect. These are real negotiated prices from our Microsoft partner agreements, not MRP.
| Line item | Perpetual Office (annual amortised) | M3approx 65 Business Standard (₹660/user/month) | M3approx 65 Business Premium (₹1,540/user/month) |
|---|---|---|---|
| Office apps (Word, Excel, PowerPoint, Outlook) | ₹18,000/user (3-yr amortise of ₹54K perpetual) | Included | Included |
| Email hosting (Exchange or third-party) | ₹600-1,200/user/year | Included (Exchange Online, 50 GB) | Included |
| Cloud storage + backup | ₹400-800/user/year | 1 TB OneDrive included | 1 TB OneDrive included |
| Antivirus/endpoint protection | ₹300-600/user/year | Basic (Defender for Office 365) | Full Defender for Business |
| MDM / device management | ₹800-2,000/user/year (third-party) | Not included | Intune included |
| DLP / data loss prevention | ₹1,200-3,000/user/year (third-party) | Not included | Included (basic DLP policies) |
| Total annual cost per user | ₹21,100-25,600 | ₹7,920 | ₹18,480 |
For a 100-person company, Business Standard saves ₹13-18 lakh per year compared to maintaining the perpetual stack. Business Premium costs roughly the same as the old stack but replaces 4-5 separate vendor contracts with one. That alone saves 15-20 hours of IT admin time per month.
The catch: if you only need Word, Excel, and Outlook, and you already own perpetual licences that are within support, migration saves you nothing right now. Wait until your next renewal cycle. I tell at least 2 prospects per month this. No point moving just because “cloud” sounds modern.
The 4 mistakes that cause data loss during migration
In 80+ migrations, we have seen data loss exactly three times. All three were caused by the same category of mistake: someone skipped the audit phase and missed something.
Mistake 1: Forgetting PST files on local drives. Outlook users in India love PST archives. They have 8 years of email in a .pst file sitting on D:\Outlook. If you do not inventory these in Phase 1, they do not get migrated. The user switches to Exchange Online, sees an empty archive, and panics.
Mistake 2: Cutting over MX records before parallel testing. If you point your domain’s MX record to Exchange Online before confirming mail flow works, and something is misconfigured, email vanishes into a queue. Run parallel flow for approx 48 hours minimum.
Mistake 3: Not testing macros and COM add-ins. That Excel macro the accounts team built in 2014? It might break on the 64-bit version of Microsoft 365. Test every macro in the pilot phase. If it breaks, you have two weeks to fix it before bulk migration.
Mistake 4: Migrating during business hours on Indian bandwidth. A 25 GB mailbox migration saturates a 50 Mbps link for approx 40+ minutes. Multiply that by approx 30 users and your office grinds to a halt. Run bulk migrations at night. Always.
Neha’s take
I have done this migration 80+ times. The technical part is the easy part. DNS records, mailbox moves, app deployment, we have scripts for all of it. The hard part is the 45-year-old accounts manager who has been using the same Excel setup since 2012 and does not want anything to change.
My advice: do not sell the migration as a technology upgrade. Sell it as “your email will stop going to spam, your files will stop living on one laptop that could die tomorrow, and you will never buy another antivirus licence.” That is the pitch that works in Indian mid-size companies. Not “cloud transformation” or “digital workplace.” Nobody cares about those words.
And if you are managing approx 50+ devices across your company, the migration is easier when devices are already managed. Talk to us about Device Lifecycle Management before you start your M365 rollout.
FAQ
How long does an Office to M365 migration India project take for a 100-person company?
approx 3-4 weeks from audit to adoption check. The actual mailbox migration takes 2-3 nights. The rest is planning, pilot testing, and making sure nothing breaks.
Will we lose our existing Office files during migration?
No. Migration copies data from your current setup to Microsoft 365. Original files stay on local drives until you choose to delete them. We keep a 30-day rollback window on every project.
Which M365 plan should an Indian mid-size company pick?
Most companies with approx 50-200 users start with Business Standard (₹660/user/month). If you need device management and DLP, go Business Premium (₹1,540/user/month). Do not buy E3 or E5 unless you have approx 300+ users and a dedicated IT team.
Can we keep some users on perpetual Office and move others to M365?
Yes, hybrid setups work. Move your email to Exchange Online for everyone (that is where the security gain is) and keep perpetual desktop apps on machines that do not need the latest features. This is common in manufacturing and warehouse teams.
What happens to our data if we cancel Microsoft 365 later?
Microsoft gives you 90 days to export your data after subscription cancellation. Mailboxes, OneDrive files, and SharePoint sites remain accessible in read-only mode for approx 30 days, then move to a 60-day deletion queue. Export everything before day 90.
approx 200+ businesses trust us. Response within approx 4 hours.
Deploying approx 50+ devices? Ask about Device-as-a-Service.
About the author
Neha leads Sirius Star’s cloud-productivity practice: Microsoft 365, Google Workspace, Zoho Workplace — licensing, tenant design, migration, adoption. She has migrated 80+ tenants in the last five years, almost all of them SMB and MSME, and has strong opinions about the over-sold SKUs and the under-used ones. She is a Microsoft Certified Modern Desktop Administrator and Google Workspace Certified Deployment Specialist.
