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Message: [QUOTE="danswa, post: 6101301"] Hi, I have a workbook that uses the NETWORKDAYS function, which is pat of the Analysis Toolpack add-in. The problem is, when the workbook is opened on another PC, then the NETWORKDAYS appear as #NAME. It is very annoying to have to explain every user to turn on the add-in. Is there a way to automatically (preferably without the use of VBA or macro's) have the add-in enabled when the document is opened? If there is absolutely no way, then what is the easiest way to use VBA or a automatic start-up macro to enable the add-in? [/QUOTE]