Go to the folder of /program files/netscape/users/[your user name]/mail and delete the inbox.snm file. That will delete the index file for your inbox which is most likely corrupted. You can save a copy if you like in case this does not fix it.
Then bring up Netscape and open the communicator. It will say rebuilding index file, and when done it should be fine. This has happened to me serveral times. Marshall Brooks Bradley wrote: > I have encountered an indeterminate Mail Program failure in > my Netscape mail system......one which prevents me from accessing my > Inbox and/or downloading my incoming messages. I get an error-prompt > stating "Netscape has caused an error in NETSCAPE.EXE" Netscape > will now Close. I encountered this same problem about a year > ago....after much palaver and "wand-waving" and $100 charge, my local > software Guru remedied the problem.....but never did tell me what he > had done.....Exactly! I will endeavor to have the problem remedied > ASAP. Meantime, this Yahoo facsimile will be my connection with the > List. Persons attempting to contact me via email, > "privately", will be forced to use this (Yahoo) address.......until I > can get the existing problem resolved. My apologies to all > for taking up this much bandwidth explaining my plight, but there are > several list members with whom I have ongoing contact....and this is > my first opportunity to inform all that I have been unable to receive > ANY mail since Saturday last. Sincerely, Brooks > Bradley. > > > ----------------------------------------------------------------------- > Do you Yahoo!? > The New Yahoo! Search - Faster. Easier. Bingo.

