If you are using Outlook 2003 I believe your contact capacity is only
limited to your computer hard disk size.  If I am not mistaken, I believe
that Outlook 2003 allows something like 33 tetrabytes (3,300 GB?) of
storage which far exceeds the hardware storage of most PC.  This was a
major change from previous Outlook versions.  Even if my figures are not
correct, your problem with saving contacts very likely lies with something
else other than storage capacity.

-THP