Hello Patrick,
My recommendation will almost always be to use Data Mart as it is the integration we are always adding functionality to. For instance, Currency Translations work in Data Mart as it is a newer feature.
One other issue I can think of is performance. Data Mart requires a much more powerful server than Legacy, so if cost is a factor, Legacy may be a good option.
There are many different things that you may want to look into.
You can find all of our printable documentation here:
www.microsoft.com/.../details.aspx
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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