Excel 2007 - Open a file with more than one person
 

Good day,
a client of mine has Exchange Server 2007 and Office Small Business 2007th
Now, more than one person always open e.g. an Excel file. This indeed appears
to note that someone has opened the file already. It should indeed
to appear who has the file open. This does not work there. Where
I set it?

Thanks for the help!

Greetings Sven