How to Switch Microsoft 365 Reseller (2026 UK Guide)

Last updated: April 2026

You can change your Microsoft 365 reseller at any time, for any reason, with no impact on your users. Nothing they touch changes — mailboxes, Teams, SharePoint, OneDrive, logins, MFA, files. All identical. The only thing that changes is who invoices you and who handles your admin.

People switch Microsoft 365 resellers for the usual reasons: rubbish support, opaque billing, no account manager, no advice on right-sizing licences, or the reseller is charging above Microsoft's RRP and hoping you don't notice.

Here's how to move, what to watch out for, and what it actually looks like.

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What you can and can't switch

You CAN switch:

• The reseller (CSP indirect provider) who invoices you
• The Partner of Record inside your Microsoft 365 tenant
• Your billing schedule (monthly / annual, commitment term)

You CAN'T switch (and don't need to):

• The tenant itself (your onmicrosoft.com identity stays put)
• Your data — mailboxes, SharePoint, OneDrive all stay in Microsoft's cloud
• Your users, licences, or admin roles
• Your custom domain, MX records, or security settings

This is why switching is low-risk. You're not migrating anything. You're just moving the bill.

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When you can switch

Any time. Microsoft allows Partner of Record changes at any point, not just at renewal.

But there's a catch: if your current licences are on an annual commitment term (common), you're contractually committed to those seats for the remainder of the year. Your old reseller will keep billing you until the renewal date even after you change Partner of Record.

Three realistic switch scenarios:

1. Switch at renewal — cleanest option. Old contract ends, new contract with new reseller begins. No overlap. Best timing if your renewal is within 1-3 months.

2. Switch mid-term — legally allowed but financially awkward. You'll pay the old reseller to term end, then the new reseller from whenever their licences start. Some customers accept the overlap if the bad reseller is causing active pain.

3. Let licences lapse and re-buy — only works if you can tolerate a licence gap of a day or two, and you accept the risk of users being locked out. Not recommended.

For 90% of customers we handle, scenario 1 is the answer — start the conversation 4-6 weeks before renewal.

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The transfer process, step by step

Step 1 — Confirm your current setup. We'll need:

• Your primary Microsoft 365 admin email
• Your tenant ID (findable in Microsoft 365 Admin → Settings → Org settings → Organization profile)
• Your current renewal date
• A list of licences you have (can be exported from Admin → Billing)

Step 2 — We give you a quote. This lists the exact Microsoft SKUs you'd keep with us, at our prices (Microsoft RRP, with 10% discount if you bundle with CTN VoIP). We'll also flag anything we'd rationalise — it's extremely common to find customers paying for licences no one uses.

Step 3 — You accept. On your side: sign the quote. On our side: we prepare the new Microsoft partnership relationship.

Step 4 — We invite you to become a CSP customer of CTN. This comes as an email from Microsoft (not us) with a link to approve the partnership. Your Microsoft 365 admin clicks the link, signs in, and accepts. That's it — takes 30 seconds.

Step 5 — On renewal date, licences move. Your old reseller's licences expire, ours activate the same day. Users notice nothing.

Step 6 — First invoice from us. You start getting billed by CTN instead of your previous reseller. Old reseller's invoices stop.

Total effort on your side: one email to send, one 30-second approval click.

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What changes on day one

• Invoices come from CTN, not your previous reseller
• Account manager is a named CTN person in Shropshire, not a ticket queue
• Support for licensing, admin, and renewal queries goes to CTN
• Partner of Record inside Microsoft 365 Admin shows CTN

That's it. Users notice nothing.

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What doesn't change

• User logins and passwords
• Multi-factor authentication settings
• Mailbox contents, rules, signatures, calendars
• OneDrive files
• SharePoint sites and permissions
• Teams channels and messages
• Admin roles and security policies
• Custom domains and DNS records

It's explicitly designed by Microsoft to be a zero-impact change.

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Pitfalls and how to avoid them

Pitfall 1: Reseller won't release the partnership. Some resellers make this harder than Microsoft intends — dragging their feet, claiming it can't be done without lengthy notice, or tying it to auto-renewed contracts you forgot about. You don't need the old reseller's permission to change Partner of Record. Your Microsoft 365 admin can approve a new partnership directly with Microsoft.

Pitfall 2: Auto-renewal traps. If you don't cancel the old licences before the renewal date, they'll auto-renew for another year and you'll double up. Make sure the cancellation (or non-renewal) is in writing with your current reseller at least 30 days before renewal.

Pitfall 3: Monthly-term overpricing. If you're currently on monthly term commitments, you're paying ~20% more than annual-term. Most resellers never bring this up because it's more revenue for them. Moving to annual commitment (billed monthly) at the switch saves real money.

Pitfall 4: Ghost licences. When migrating, review the licence list. Ex-employees, old contractors, decommissioned service accounts often still have licences assigned. It's normal to find 10-20% of licences are unused. We rationalise this automatically in our quote.

Pitfall 5: Billing lag from old reseller. Some resellers keep billing for 60+ days after renewal due to "administrative lag." Legally dubious. Require confirmation in writing that billing will stop on renewal date.

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Why bother switching at all?

The three reasons we hear most:

1. "They charge above Microsoft RRP." Some resellers mark up 10-20% over Microsoft's list price. A good UK reseller should match Microsoft RRP (what you'd pay buying direct).
2. "Support is terrible." Tickets sent into voids, account managers who never respond, issues punted back to Microsoft. A good reseller takes your call.
3. "No proactive management." Your reseller never mentions annual increases, never reviews licence counts, never tells you when a product is being end-of-lifed. That's the job.

Bonus reason: bundle savings. If you already use a UK VoIP or business mobile provider, there's almost always a reseller who'll discount Microsoft for bundling with your phones. We give 10% off.

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Timeline

• Week 0: You tell us you want to switch; we ask for tenant ID and licence list
• Week 0-1: We give you a quote, including rationalisation and bundle discount
• Week 1: You accept; we send the Microsoft partnership invite
• Week 1: You click the partnership link (30 seconds)
• Renewal date: Licences transfer. Users notice nothing.
• Renewal date + 30 days: First CTN invoice.

No downtime. No data migration. No user retraining.

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FAQs

Will my users notice anything?

No. Nothing they touch changes. Same logins, same apps, same files. The change is entirely on the billing and admin side.

Can I switch back if I don't like CTN?

Yes. Same process in reverse. You are never locked in — Microsoft allows Partner of Record changes freely.

Do I lose any licence history or audit logs?

No. All audit logs, Microsoft 365 usage reports, security history, and compliance records stay inside your tenant. They're yours, not the reseller's.

What if my current reseller is also my IT support company?

Think carefully before switching. If they also manage your endpoints, servers and networks, unbundling Microsoft 365 from them can strain the relationship. Have the conversation with them first — sometimes that alone sorts the issue.

Does switching reseller reset my Microsoft 365 anniversary date?

No. Your renewal date is tied to each licence SKU's purchase date, not the reseller. Switching mid-term keeps existing renewal dates.

Can I switch just some licences, not all?

Technically yes but it's messy. Most people move everything in one go at renewal. Splitting tenants between two resellers doubles admin and complicates billing reconciliation.