Microsoft 365 & Cloud
When is the right time to move your business to the cloud? Trigger events, a readiness checklist and when to wait
The events that make a cloud move worth doing now, from server end of life to an office move, plus a readiness checklist and when waiting is the better call.
By Dig IT SolutionsUpdated 8 September 20267 min read
Short answer
The right time to move to the cloud is usually when a trigger event makes staying put more expensive or riskier than moving: a server reaching end of life, Windows Server 2016 or 2019 losing support, an office move, a new branch, more remote working or a ransomware scare. Move with a plan, not in an emergency.
Most small businesses do not move to the cloud because a strategy document told them to. They move because something forces the question: the server starts throwing disk errors, the lease is up, a second office opens, or a phishing email gets closer to the finance team than anyone would like. Recognising those moments early is the difference between a planned migration and a weekend spent rebuilding from backups.
Why timing matters more than the technology
Cloud services such as Microsoft 365 have been mature for years. The technical question of whether email, files and collaboration can run in the cloud was settled long ago. The open question for a business of up to 250 people is when the move pays back, and that depends on what you are running today and what is about to change.
Moving too early means writing off hardware that still has years of useful life. Moving too late means paying for an emergency migration under pressure, usually after a failure, when nobody has time to tidy the data or train the staff. The best migrations happen in the window between those two points, and trigger events tell you when that window has opened.
Trigger events that should start the conversation
| Trigger | Why it matters | Sensible response |
|---|---|---|
| Server warranty or support contract expiring | Replacement parts and vendor support become slow or unavailable | Cost a like-for-like replacement against a cloud alternative before renewing |
| Windows Server 2016 (support ends January 2027) or 2019 (January 2029) | No more security patches after the date, which Cyber Essentials treats as a failure for in-scope systems | Plan the migration at least six to twelve months ahead |
| Windows 10 desktops (support ended 14 October 2025) | Unsupported PCs and an old server compound the risk | Refresh devices and move file services in the same project |
| Office move or refit | Servers, cabling and comms all get touched anyway | Move email and files beforehand so the new office needs less on-site kit |
| Opening a new branch or depot | A second site needs the same files and systems | Cloud file services stop a site-to-site link becoming a single point of failure |
| More staff working remotely | VPN into an office server is slow and fragile at scale | Move the data staff need daily into SharePoint or OneDrive first |
| Lease or finance cycle ending | A natural decision point on capital spend | Compare a three to five year server refresh with a monthly subscription |
| Ransomware near miss or incident | Shows how recoverable the current setup really is | Fund the move and the backup plan together |
| Headcount growth | Licences, storage and support scale with staff | Cloud per-user costs rise in step with hiring rather than in server-sized jumps |
Hardware and operating system end of life
A server bought five or six years ago is typically out of manufacturer warranty, running an operating system near the end of its support life, and holding more data than it was sized for. Microsoft publishes the dates on its product lifecycle pages. Windows Server 2012 and 2012 R2 ended in October 2023, Windows Server 2016 extended support ends in January 2027, and Windows Server 2019 follows in January 2029. Windows 10 support ended on 14 October 2025.
Running past those dates is not illegal, but it leaves a machine with known and unpatched vulnerabilities. The NCSC Small Business Guide puts keeping software up to date among the basic controls every organisation should have. An unsupported server fails that test by definition.
Office moves and new sites
An office move is the most convenient trigger of all. Every cable, switch and phone gets touched anyway, so moving email and files to the cloud beforehand means the new office needs a good internet connection, a firewall and Wi-Fi rather than a server room. If a move is on the horizon, our IT for office moves service brings the cloud question into the same plan.
Opening a second site raises a similar question. Two offices sharing one on-premise server need a site-to-site VPN, and every user at the remote site depends on that link. Mr Plant Hire, a multi-depot plant and tool hire business established in 1981, runs Microsoft 365 with SharePoint for document sharing between its companies while keeping Windows servers on site for the systems that need them. That mix is described in the Mr Plant Hire case study and is a realistic end state for many multi-site firms.
Remote working and growth
If more than a handful of staff now work from home or from client sites, a VPN back to an office server is usually the slowest and least reliable part of their day. Moving the files they use daily into SharePoint and OneDrive removes that dependency. Growth has the same effect: every new starter needs a licence, storage and a device, and cloud services scale those per user rather than in server-sized steps.
A ransomware near miss
A blocked phishing email, a suspicious login alert or a competitor being hit will sharpen minds. The right response is not panic but a review of how you would recover. Cloud email and files do not remove the need for backup, so any migration should include a third-party backup for Microsoft 365, because Microsoft's own retention windows are limited. Our article on whether Microsoft 365 includes backup explains what Microsoft covers and what it does not.
A cloud readiness checklist
Before committing to a date, be able to answer yes to most of these:
- Internet: is your connection fast and reliable enough for every user to work from the cloud all day, with a second line or 4G/5G failover for the office?
- Data: do you know what data you hold, who owns it, and what can be archived or deleted before it moves?
- Applications: have you listed every line-of-business application and confirmed whether it runs in the cloud, needs a hosted server, or must stay on site?
- Identity: are you ready to enforce multi-factor authentication for every user from day one?
- Devices: are staff PCs on a supported version of Windows, and can they be managed remotely?
- Backup: is there a plan for backing up cloud data independently of the provider? See Microsoft 365 backup.
- People: is there a named owner for the project internally, and time set aside for training?
- Budget: have you compared Microsoft's published UK list prices for the plans you need against the true cost of the server refresh you are avoiding?
Microsoft's published UK list prices are on its plan comparison page. A small on-premise server with licences, backup and support typically costs several thousand pounds up front plus ongoing maintenance, so the comparison is rarely close on capital. It can be close on monthly cost over five years, which is why the trigger event matters more than a spreadsheet.
When not to move yet
Cloud is not always the right answer this year. Hold off, or move only part of the estate, when:
- A line-of-business application (practice management, accounts, CAD, hire software) only runs on a local server and the vendor has no supported hosted option yet.
- Your office internet is poor and a better line is months away. Cloud on a bad connection makes everyone slower.
- The server is under three years old, in warranty and on a supported operating system. Use the remaining life and plan the move for the next refresh.
- Large files such as video, drawings or scans are edited all day by several people. Those often stay local, with the cloud used for everything else. Our article on what to keep off the cloud covers the detail.
- Nobody internally has time to own the project. A migration without an owner produces a messy tenant that costs more to tidy later.
A staged approach works well: email first, then files, then whatever the applications allow. Each stage reduces what the on-premise server has to do, and the last box is often decommissioned two or three years after the first mailbox moves. Our cloud migration service is built around that phased model.
What to do next
If one of the triggers above applies to you, the cheapest time to plan is now, while the server still works and there is time to clean up data and train staff. Contact Dig IT Solutions to talk through where your business sits on the checklist and what a phased move would look like.