Hi Denis ---

There are a variety of reasons one may with to consider this. Security is an issue, but one mitigated a bit through server security. Access to the data from diverse sources, ie, n-tier is another reason. VFP keeps up real well with SQL Server regardless of the number of users IMHO, *but* SQL Server, being a server database, handles large numbers of simultaneous transactions better. Plus, SQL Server has more configutation options as a database to fine-tune operations. Finally, SQL Server databases are much, much more physically secure than DBF files. They rarely corrupt.

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>Could you tell me when it is the right time to consider upgrading an application from VFP to SQL/SERVER?
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>Is it only based on security, the number of users, the performance ???