eSky and Seamless Data Migration from M365 to Google Workspace
Deployment date: 2025
Sector: tourism
Google Cloud
Following the acquisition of Thomas Cook, the world’s oldest travel brand, eSky needed to unify its digital workplace and consolidate data into a single ecosystem. OChK experts supported eSky in achieving this goal, executing a comprehensive migration of approximately 3 TB of data from Microsoft 365 to Google Workspace while ensuring total business continuity throughout the process. The partnership resulted in a cohesive work environment, optimized licensing costs, and enhanced security and operational efficiency across the entire organization.
About eSky
eSky is a leading international Online Travel Agency (OTA) headquartered in Poland, offering comprehensive travel search and booking services. Their portfolio includes airfare, hotel reservations, "Flight+Hotel" packages, travel insurance, car rentals, and airport transfers. Operating in over 50 countries and serving millions of customers annually, eSky leverages cutting-edge technology to make travel planning fast and seamless. The company is a market leader in the OTA sector across Central and Eastern Europe.
Challenges
The acquisition of the historic British travel brand Thomas Cook presented eSky with the urgent necessity of unifying its digital workplace within a newly integrated organizational structure. This process required defining consistent internal communication standards for teams operating across diverse corporate cultures and executing a full-scale data migration, as Thomas Cook relied on Microsoft 365 while eSky’s operations were built on Google Workspace. The overarching priority throughout this transition was to ensure zero business disruption, maintaining total operational continuity and providing a seamless experience for all users involved in the integration.
The decision to choose OChK as the primary project partner was driven by our extensive track record in managing complex migrations involving both technology stacks, alongside a flexible approach. Beyond technical know-how, OChK demonstrated the ability to react swiftly to non-standard requirements while effectively minimizing operational risks.
Solution and implementation
To standardize tools across the organization, OChK experts migrated approximately 3 TB of data from the thomascook.com domain to the new environment. The scope included: 154 SharePoint channels, 134 mailboxes along with OneDrive data, 83 Microsoft Teams channels. The process followed a structured roadmap:
pre-migration discovery and source environment analysis,
provisioning test accounts for lead migration engineers,
execution of test, target, and delta migration phases,
detailed post-migration report analysis.
By prioritizing transparent communication and an incremental approach, the project was completed in just over a month. Key success factors included a shared storage space for migration files, weekly syncs, and clear status reporting at every stage.
Technologies used
CloudM Migrate
Results
As a result of the migration, eSky gained a cohesive work environment within Google Workspace. Easy access to key communication and collaboration tools translates into higher team productivity and efficiency, while also fostering a sense of belonging to a single organization.
Reducing the number of active licenses led to a significant decrease in IT infrastructure maintenance costs. Standardizing solutions within a single ecosystem also simplified technology environment management—at both the operational and administrative levels.
The implementation of security mechanisms, such as multi-factor authentication and optimized password policies, further strengthened the organization's data protection without compromising the user experience.
The key to the success of the migration from Microsoft 365 to Google Workspace was our collaborative, phased approach. The decision to migrate data in a “canary” method—department by department—allowed us to maintain full operational capacity and provide employees with the highest level of post-migration support. Despite this caution, thanks to OChK’s experts, the process proceeded very efficiently and was completed in just over a month. Users, who were strongly attached to their previous tools, felt well taken care of, and the transition itself took place without any disruption to business operations.
Piotr Pełka
IT Support & Systems Engineering Team Leader, eSky
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