When I create a static Excel file from a contact list and then open the xls file I get this message:
.......file is in a different format than the extension blah, blah,blah. I am able to open and work with the file just fine, however, I have noticed that if I attempt to use the file to upload to Constant Contact to send emails Constant Contact can't read the file.
If I copy the data from the original xls to a new xls file, I am able to upload to a service like Constant Contact. Has any body seen this behavior or do you understand why the behavior?
Thank you,