Our company has been using Excel in Shared Workbook mode, which allows users to simultaneously change a work sheet, and users see each other's changes and not overwrite changes when the workbook is saved. We have been testing Excel Worksheets stored Sharepoint document Libraries, and find we can no longer do this - the MS Sharepoint tech says its strictly Check in- Check Out, single user. At the same time the MS Excel guy says you should be able to do it. Is anyone out there sharing a book from a Doc Lib as a Shared Workbook?