I create financial models that are often larger than 15MB. Naturally,
I compress them before emailing or saving to a network drive. This has
worked great until recently when files stopped compressing very much.
The one that I'm currently working on is 18MB and only compresses to
17 MB... I am using WinZip 9.0 and Excel 2003.

The size of the model is due to using arrays and an enormous amount of
data. There are no macros and I have tried removing charts and graphs
but it didn't make a difference.

Any ideas will be much appreciated.