IT infrastructure migration: modernizing and securing your environments

An infrastructure migration involves transferring, modernizing or reorganizing all the technical elements of an information system: servers, networks, storage systems, virtualized environments, backup solutions, cybersecurity and the Cloud. It can concern part or all of the technical foundation, whether in a datacenter, a public cloud (Azure, AWS, Google Cloud) or a hybrid environment. The aim is to improve infrastructure performance, security and resilience, while reducing costs and technological debt.
At IT Systèmes, we orchestrate complete migrations, from design to production launch, with support for supervision, governance and RGPD compliance.

Infrastructure migration becomes necessary when a system reaches its technical or functional limits. The main reasons are :

• aging hardware and end-of-support systems (e.g. Windows Server, VMware, Exchange on-premise);
• the need to reinforce safety and regulatory compliance;
• the desire to reduce energy and operating costs through virtualization or the Cloud;
• a merger or acquisition requiring the consolidation of IT environments.
  Migrating also helps to modernize management, introduce monitoring and automation tools, and support the company's digital transformation.

IT Systèmes masters all infrastructure environments:

• Physical data centers (racks, servers, SAN/NAS, backup) ;
• Virtualized environments (VMware, Hyper-V, Proxmox) ;
• Microsoft infrastructures (Windows Server, Active Directory, Exchange, SharePoint, RDS) ;
• Cloud and hybrid solutions (Azure, AWS, Google Cloud) ;
• Multi-site networks and interconnections (LAN, WAN, SD-WAN, VPN, Wi-Fi).
  Our engineers have over 60 technical certifications and design reliable, scalable architectures that comply with best market practices.
• Microsoft 365 supporter

Avoiding outages is a top priority. IT Systèmes schedules switchovers during non-working hours (NWH), generally at night, on weekends or during off-peak periods.
We implement real-time replication and continuous synchronization mechanisms to maintain service availability. Blank tests are carried out in a pilot environment to anticipate risks and validate failover scenarios. At the same time, a rollback plan is systematically prepared to guarantee immediate restoration in the event of unforeseen circumstances.
This organization enables us to ensure migrations with no perceptible impact on users, even on critical systems.

During a merger, acquisition or organizational change, it is often necessary to migrate a Microsoft 365 / Azure tenant. This involves transferring all users, licenses, groups, mailboxes, OneDrive, SharePoint, Teams and Azure resources from one environment to another, a sensitive operation as it impacts messaging, collaboration and user access. IT Systèmes masters this type of migration thanks to automated tools and FlexFlow synchronization, which maintains consistency between the two tenants until the switchover is complete.We guarantee the preservation of access rights, metadata, historical data and RGPD compliance, without any interruption of service.

Data security is at the heart of every project. We implement flow encryption protocols (TLS, SSL, AES-256), role-based access controls (RBAC), and strict network segmentation to limit risks.
Full backups are performed prior to migration and stored on an isolated environment. During the transfer, real-time supervision enables us to detect any anomalies or latency.
Our methods comply with ISO 27001, NIS2 standards and RGPD principles (minimization, traceability, confidentiality). Each step is documented to ensure a complete audit trail in the event of an internal or external audit.

Yes, and this is one of IT Systèmes' specialties. We can help you migrate to Microsoft Azure, AWS or Google Cloud, depending on your business needs and regulatory constraints.
Our experts define the best approach:

• Lift & Shift: as-is migration for fast time savings;
• Replatforming: adapting to Cloud specificities to improve performance;
• Refactoring: redesigning applications to take full advantage of native Cloud services.
  We ensure the security, redundancy and ongoing supervision of migrated environments, while integrating FinOps optimizations to reduce operating costs.

The duration depends on the scope of the project, the number of servers, the volume of data and the level of complexity.
A migration of isolated servers can be carried out in a few days, while a complete overhaul of infrastructure across several sites can take several weeks.
IT Systèmes draws up a precise schedule including :

• a scoping and audit phase;
• preliminary tests on a pilot environment ;
• progressive migration or Big Bang in HNO ;
• post-migration validation and stabilization.
  This methodology guarantees a smooth, predictable workflow, with no disruption to users.

A poorly planned migration can result in :

• prolonged service interruptions ;
• loss or corruption of data ;
• software incompatibilities ;
• incorrect network or security configuration ;
• uncontrolled costs after the switchover.
  At IT Systèmes, we anticipate these risks with a detailed scoping phase, load tests, rollback scenarios and real-time supervision. Our migrations are supervised by experienced project managers, guaranteeing transparency and reliability.

Once the migration is complete, our engineers carry out a complete hardening of the :

• activation of multi-factor authentication (MFA) ;
• logging and auditing of connections ;
• network segmentation and Zero Trust policies ;
• configuration of automated backups and PRA/PCA.
  We also implement monitoring tools (Microsoft Sentinel, PRTG, FlexFlow Monitoring) to detect any post-migration anomalies. A detailed audit report is provided, guaranteeing RGPD compliance and the resilience of the new environment.

Because we combine technical expertise, proven methodology and human support.We have successfully carried out dozens of complex migrations - datacenters, virtualized environments, Microsoft 365 / Azure tenants, multi-site infrastructures - for companies of all sizes.Our 60 certifications, our FlexFlow automation tool and our processes aligned with ISO 27001 standards guarantee rapid, secure and compliant migrations.Our customers benefit from tailored support, total service continuity and 24/7 support to ensure the stability and performance of their new infrastructures.