Monarch uses Microsoft components to create its Excel files. It is probably to do with the version of Jet. But if you still have 1 pc with NT and a comparable spec pc with 2000 available for testing, then try the following.
Launch Monarch with the same report and model on both PC’s. On each, go into the Options/Folders and File Types menu and set the XLS file version to Excel 2.1 (Monarch v3) and time the export.
This uses a different method of exporting. Any difference in the export time here is likely to be caused by a general system performance issue. Check out swap files, free hard disk space, disk fragmentation, a working and relatively clean temp directory etc.
If the export times are comparable here, but you still get large differences when exporting to any other version of Excel, then it is probably a Microsoft issue. These can arise by mixing different versions of Windows and Office (for example Office 98 on a Win 2000 PC) or many other applications can cause problems and conflicts.
You should be able to resolve these by visiting
Usually downloading MDAC 2.6 found at [url="http://www.microsoft.com/data/download_26sp1.htm"]http://www.microsoft.com/data/download_26sp1.htm[/url] and Jet 4.0 sp3 found at [url="http://www.microsoft.com/data/download_Jet4SP3.htm"]http://www.microsoft.com/data/download_Jet4SP3.htm[/url] fixes it.
But you should check the full link for warnings and known issues.