I added a spreadsheet to my working project and joined it to a feature class. I got the information I needed, removed the join and then removed the spreadsheet from my project. Now, I cannot open the spreadsheet in Excel unless I am not in ArcMap. If I shut down my Arcmap session (editing or not) I can open it. However, if I open the spreadsheet first and then open ArcMap it works...Can anyone help? I need to have it open at the same time I am in Arcmap.