Hello Patrick,
The Data Mart and Legacy data integrations in MR differ in how they get your data from GP.
The Data Mart integration has it's own database that it regularly updates after updates to the GP database. This is a separate database which has the benefit of being able to be separated from GP, meaning you have less performance issues at the time of report generation.
The Legacy integration, however, pulls directly from the GP database. This has the benefit of being 100% up-to-date, however, this leads to performance issues at times. Please be aware that the Legacy integration is just that, legacy. Moving forward, I recommend users swap over to Data Mart.
Overall, it is up to you to decide which to use. If you have a big company, then the Legacy reports are going to take almost hours to run. If you have a small company, either one is a good option.
Please let me know if you have any additional questions on this.
Justin Sutton
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Microsoft Dynamics GP Support
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**This posting is provided 'AS IS' with no warranties and confers no rights.**