Switching to a new IT supplier: Step by step without downtime

Changing an IT supplier is often one of the most stressful decisions for business owners. Concerns about downtime, data loss or chaos are understandable. But with a good plan and the right approach, the transition can be smooth. In this article, we will go through how to do it.

Why companies change their IT suppliers

Most common reasons why companies look for a new IT partner:

• Slow response: You wait hours or days for a repair instead of minutes.
• Lack of proactivity: The supplier only puts out fires but does not prevent problems.
• Poor communication: You do not receive updates on your infrastructure status; everything must be gathered manually.
• Unclear billing: Invoices without a clear breakdown of work, hidden charges.
• Vendor lock-in: You do not have access to your passwords, homes or configuration.
• Insufficient security: Missing reserves, outdated systems, no monitoring.

Step 1: Prepare before notifying your current supplier

Before telling your current supplier you are leaving, do your homework:

• Check the contract: What are the notice periods? Are there any penalties for early termination?
• Find out what you own: Domains, licences, hosting, IP addresses: what is registered to your company and what to the supplier?
• Take stock of your inventory: List of all equipment, services and systems managed by the supplier.
• Choose a new supplier: Have your new partner ready before you terminate your current one.

Step 2: Handover of documentation

The crucial part of the transition. You must obtain from your current supplier:

• All passwords and access credentials: Servers, routers, switches, Wi-Fi, admin accounts, VPN, cloud services, email management.
• Site documentation: Wiring diagram, IP addresses, VLAN configuration.
• List of licences: Licensed keys for Windows, Office, antivirus and other software.
• Deposit strategy: Where is the backup data stored, how frequently, and where are the media files kept?
• Supplier contacts: ISP, hosting company, software supplier.
• History of changes: What has been happening recently and which projects are currently underway.

If the existing supplier refuses to provide documentation or passwords, this is a warning sign but not an obstacle. A competent new supplier can gain access by other means, resetting passwords, contacting the hardware manufacturer, and so on.

Step 3: Audit and handover

A new supplier should begin with an audit of the existing infrastructure. They will review all systems, check the status of security, backups and configuration. The result is a report detailing the current state and proposed priorities.

During the audit, a new supplier:

• Check the functionality of all equipment and services.
• Change access credentials previously held by the former supplier.
• It will check the status of backups and perform a test restoration.
• Identifies critical defects requiring immediate repair.

Step 4: Transitional period

The ideal scenario includes a transitional period (2-4 weeks) during which both suppliers operate in parallel. The incumbent supplier remains available for queries and the transfer of know-how, while the new supplier takes over management.

In practice, this is not always possible, sometimes the existing supplier is unwilling to cooperate. Even so, the transition can be managed; it simply takes a little longer because the new supplier must gather all the information themselves.

Step 5: Changing passwords and access rights

After taking over management, all passwords accessible to the previous supplier must be changed:

• Admin accounts on servers and network devices.
• Access to cloud services (Microsoft 365, Google Workspace).
• VPN connection.
• Access to hosting, domains and DNS.
• Access to supplier management portals (ISP, antivirus, certificates).

This is a safety necessity, not an expression of distrust. Every professional IT supplier will understand this.

Step 6: Setting up monitoring and support

The new supplier will set up infrastructure monitoring, a helpdesk for employees and begin regular management. It is important to communicate with employees:

• Who is the new IT contact and how to reach them.
• What are the response times and procedure for reporting problems?
• What has changed and what remains the same.

A common fear: "What if it gets worse?

A natural concern. Reduce it by:

• Choose a proven supplier with references (see our article How to choose an air-conditioning company).
• Agree on a trial period (e.g. 3 months) with the option to terminate.
• You have a clear SLA with defined response times.
• Do you regularly assess satisfaction (monthly meetings or reports)?

Transition timeline

• Week 1-2: Select a new supplier and sign the contract.
• Week 3: Notice to the existing supplier requesting handover of documentation.
• Week 4-5: Audit and handover to a new supplier, password changes.
• Week 6-8: Transitional period, parallel operation.
• Week 8+: Full operation under the new supplier, termination of the contract with the old one.

Summary

Changing your IT supplier need not be traumatic. With a clear plan, adequate preparation and the right new partner, it is a safe and smooth process. The key is to start early, have the documentation ready and avoid rushing: a quality transition takes 4-8 weeks.