One of my users has a new error that just started appearing. He's on a new Macbook Pro with Office 2011 installed. One of our file servers is a Windows Server 2003 server. Just yesterday his Mac was able to open, view, and edit excel docs that were saved on that server. Now, when trying to open the Excel doc from his Mac he gets an error saying the file is not found. It's clearly there but the Mac won't open it in Excel. Our PCs open the files just fine in Excel 2010.
What could have changed?