Last verification made... Problem become more clear but still not solved...
Should come from the Excel 2007 compatibility mode...

Facts... ActiveWorkBook.save command lunched in the immediate window on a
file situated on a remote drive (file server)...
- Is Working on an .xls file with Excel 2003
- Is Working on an .xlsm file with Excel 2007
- Is Not Working on an .xls file with Excel 2007 (compatibility mode)

Error returned being
= xxx.xls file already in use. Try again later...

Alain