We were having an issue with the macro security pop-up showing up, so we created a digital signature for our excel file which worked fine, but when we created a link on our web site to the excel file, the excel file had big problems. For example, the chart disappeared... Has anyone posted an excel file on the web with a digital signature. Also, we have about a hundred excel files. Do we need to create a signature for every xls file. And is the signature valid only on the local machine? Thanks for your help