Mega to Arbor Business Migration

Migrating 118 000 accounts from a legacy system to a new one within time, and to budget - eliminating risk and costs. The sceptics said it couldn't be done......”

The client is one of New Zealand’s largest full-service telecommunications company.  It offers a range of voice and data products to business, government, wholesale and residential sectors. The client also offers trans-Tasman services.


Over 110,000 billing accounts, ranging from household to large corporations, needed to be migrated from the legacy billing system to the new one, this being one of the client's six strategic programmes.   A similar programme had been attempted twice previously without success leading to much scepticism across the business both in terms of whether it could be done at all, and whether the aggressive timelines were achievable.


Tenzing was invited to lead the business migration and drive the migration process from initial design & approach, develop & migration and test & shutdown. Tenzing led a number of specialised areas in the project, including:

  • Programme Management – providing relevant and extensive knowledge and experience played a significant element in both creating the upfront solution and approach; managing and delivering the required development and migration; ‘pushing’ through issues, and maintaining good momentum throughout the programme lifecycle
  • Change Management – implemented a communication framework to deliver Newsletters, Stakeholder Briefings, and InfoLines. The project was subsequently requested to set up similar communications for other projects
  • Data Management – provided data management practitioners to investigate the migration approach and design. Developed unique supplementary tools such as reconciliation tools, migration dataset-select tools, data entry and error reporting.
  • Test & Validation Management – bringing to the table a flexible testing methodology that was tailored for the unique processes.


All 118,000 accounts were off the legacy billing system within the stipulated timeframe and the system de-coupled as planned. The legacy billing system continues to be available for data history information in a “read only” state. The successful migration of the accounts eliminated the risk associated with running out-of-date and unsupported billing software and it also reduced the ongoing maintenance costs of running two billing systems in parallel.

Services provided /

Industry / Telecommunications