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Changing from one computer system to a different one, entailing changes in software and the transfer of data from the old system to the new, possibly necessitating conversion of data from the old format into another for use on the new system. For example: switching from an NCR-based system to an IBM constitutes a migration, while simply moving to a larger, newer, NCR system would be an 'upgrade'.

Migrations are complex, and any organisation contemplating or conducting one would be well advised to appoint a dedicated Project Manager and team, to ensure its smooth implementation.

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