M365 Global to 21Vianet migration in Tianhe

Moving M365 Global to 21Vianet migration in Tianhe is rarely a straight copy of mailboxes. For a company operating in China it starts with a decision most markets never face: whether your users should sit on the global Microsoft tenant or the local service operated by 21Vianet — and then how to move between the two without losing mail flow, Teams history, or the audit trail your head office expects.

NETK5 plans and runs M365 Global to 21Vianet migration work in Tianhe for foreign-owned businesses: a pre-migration audit, tenant and licence review, the cutover itself, and the support in the weeks afterwards when the small problems surface. Global tenant or the local service — that choice drives everything else.

Why M365 Global to 21Vianet migration in Tianhe is not like migrating anywhere else

Treat the two clouds as different products, because that is what they are. Licences differ, some features behave differently, and performance comes down to how traffic leaves your office and where it joins Microsoft’s network. Then there is the compliance angle: where personal data may legally sit, and what you can hand to a regulator or a head office when they ask.

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. Typical migrations take a few weeks end to end.

The scope we move

• 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 checked before and after
• Identity — Entra ID, groups, authentication and conditional access
• Endpoint policy and Intune device enrolment
• DNS records, domains, and the licence position on the new tenant

User mailboxes move first, then the collaboration content, so people keep working while the rest 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 around your team’s calendar
5. Hypercare — we stay on for the fortnight after cutover, 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 Global to 21Vianet migration in Tianhe 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.

Our experience

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.

Questions we get asked

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?

With a properly planned cutover, barely: mail flow switches inside a window and everyone signs back in. The slow part is the settling-in — profiles, devices, shared mailboxes, and the occasional Teams channel that surprises you.

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 Global to 21Vianet migration in Tianhe

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.