I use excel 2007, several files are updates from my original 2003 package.
When updating a 2003 on saving its gives a warning saying on using 1997-2003
all may not be saved. Since I email these files to contacts who only have
1997-2003 I say no . This has never been a problem until now. On opening a
particular file I only get a clear blue screen, and all the prevously saved
files on which the last is based are the same! I fear I have activated
somehing, but what.

Help please.

I know very little about excel or even computers so simple terms please.

Thanks

Paul de Vos