M365 migration in Tokyo

M365 migration in Tokyo is one of those projects that looks tidy in a plan and rarely stays that way. The first fork in the road is China-specific: stay on the global Microsoft tenant, or move to the 21Vianet-operated service? Everything afterwards — mail flow, Teams history, the audit trail your head office asks for — follows from that one decision.

We run the whole sequence for foreign-owned companies in Tokyo: audit first, then tenant and licence design, then the cutover, then the weeks of settling-in while the small faults surface. Nobody enjoys a migration; the job is to make it unremarkable.

Why M365 migration in Tokyo is not like migrating anywhere else

A global Microsoft 365 tenant and the China-operated service are not the same product with a different logo. Licensing differs, some services behave differently on each side, and performance depends on how traffic is routed between your offices and the nearest Microsoft edge. Add the compliance question — where personal data may legally sit, and what you can evidence to a regulator or a head office — and the migration becomes a design exercise, not a copy job.

Nobody touches a mailbox until the audit is done: what you are licensed for, how Domains and DNS are set, which mail rules exist, how Teams and SharePoint are genuinely used, how identity is configured, and where the devices are enrolled. A straightforward tenant move take a few weeks end to end.

What we migrate

• User and shared mailboxes, plus the mail-flow rules around them
• Teams, channels and chat history, where the move allows it
• SharePoint and OneDrive content, with permissions verified on both sides
• Entra ID, groups, sign-in policy and conditional access
• Devices and policy, including Intune enrolment
• Domains, DNS records and the licensing picture on the destination tenant

We move mailboxes first and collaboration content second, which keeps the team productive while the remainder follows.

How the project runs, step by step

1. Establish what you have today against what the business genuinely needs
2. Settle the destination design: tenant, licensing, routing
3. Run a pilot group and record what actually changes for users
4. Cut over in a planned window; we schedule it outside business hours
5. Hypercare — we stay on for hypercare, while the small faults surface
6. Leave you with documentation, and keep supporting the estate afterwards

Where we work

We are not a single-city provider. NETK5 dispatches engineers across mainland China: our own team is based in Shanghai, Beijing, Guangzhou and Hong Kong, and we staff projects elsewhere in the country as clients need them — Xi’an, Chengdu, Taixing and beyond. Outside China we have delivered rack-and-stack work and WiFi surveys in Japan, Korea, Singapore and Taiwan, usually for international companies coordinating several sites from a head office that has never been on site.

For M365 migration in Tokyo that matters in a practical way: work can be planned around a visit rather than a relocation, and the same team that surveys or installs can hand over documentation the head office can actually use.

Where we have done this before

Our China practice dates back to 2002 and Microsoft 365 work sits at its centre. We ran a pilot migration from the global tenant to 21Vianet for a client here, and we run cloud estates day to day — one of them more than thirty Azure virtual machines alongside Microsoft 365. Siemens, Nestlé, McKinsey and JLL are among the names we work with, generally alongside the international IT firms whose client sites we support.

The questions that come up every time

Do we have to move to 21Vianet if we are in China?

No. Plenty of foreign-owned companies run on the global tenant and it works. The trade-offs are performance, routing, and how comfortably you can evidence data handling. Some migrations go the other way — from 21Vianet back to global — when a company restructures or leaves. The right answer depends on your users, your regulator and your head office, which is why the audit comes first.

How long are users without email?

Very little, if the cutover is planned properly: mail flow flips inside a window, users sign in again, work resumes. The time goes into the days afterwards — profiles, devices, shared mailboxes, and the odd Teams channel that behaves differently.

Can you support us after the migration?

Yes, and a good share of our migration work becomes ongoing support — helpdesk in English and Chinese, monitoring, and someone who already knows how your tenant was built.

Talk to us about M365 migration in Tokyo

Tell us what you have now and what you need to end up with — tenant, users, sites, and any deadline driving it. We will tell you what the move involves and what it costs before anyone starts.