There are four types of maintenance:

• Corrective maintenance 
• Adaptive maintenance which modifies software to interface with changing environments such as new operating systems
• Perfective maintenance which satisfies requests for new functionality
• Preventative maintenance which improves reliability of the applications

ATDI has a policy of continuous innovation and development and all customers with a valid maintenance agreement can upgrade their application throughout the contract period.

All upgrades are password protected. For more information about upgrades, maintenance agreements or authorisation please contact: support@atdi.co.uk

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ICS Telecom nG v.8.8.7
IMP Calc v.2.15