Large archive conversion problem

Hi,

I am having trouble in converting large archives ( since 1990 ).

All my emails are in .txt format  on SunOS cdnemailweb.Cadence.COM 5.8
Generic_108528-19 sun4u sparc SUNW,Ultra-80

 

Here are my trials :

1. mhonarc -add /usr1/archives/*.txt  ( doesn't work ) fails with
Arguments too long

 

2. find /usr1/archives/ | xargs cat > /tmp/mbox

    mhonarc -add /tmp/mbox

   fails with Unable to create temp file   Too many open files error

 

   I increased limit to 1024 using limit command

   This time I will get Unable to create temp file Bad file number

 

3. I did a cat on all files by year / quarter ( No use still above
problem )

    cat on all files by year and month works but takes longer time than
what I expected.

 

   Is there any simple solution to process these large archives.

 

Thanks for all your help.

Rangesh