I wrote an app that creates an excel spreadsheet, it works fine on my computere but when I move it to my production server it doesn't create the excel spreadsheet. I am using the Microsoft.Office.Core library, do I need to register something on the server ??? I have excel installed on the server.

Are the Office PIAs installed on the server?

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Joe (Microsoft MVP - XML)

Not sure how can I tell??

is the 2.0 framework on the server. you could create an installer package for your application if you haven't already. it will automatically detect the need prereqs and install them if necessary