Early man faced a lot of dangers, and the fight-or-flight response evolved to help them evade or battle those dangers in order to survive. Today, it's what allows an ordinary Joe to rush into a burning building or a mother of three to lift a car off of one of her children -- a phenomenon known as hysterical strength.
The Zee Drive trial subscription limits the amount of data you can upload or download through your mapped drives in any given 24 hour period to 5,000 file uploads or 3GB of data and 10,000 file downloads or 5GB of data. Zee Drive requires Microsoft .Net 4.x and Windows.
Excel 2003 has a limit of 1 GB and Excel 2007 has a limit which is controlled by Windows, allowing 2 GB, although differences between Excel 2003 and 2007 mean that you may not be able to use larger workbooks with 2007 than with 2003. See Memory Limits for details.