Thanks for all the input. checking out the web i found that it cannot be done. apparently it seems that for NTFS files sys, a rename seems to include delete operation, i read that it was a delete/create operation and thus delete right is needed. (MS server 2003 AD)
but let me describe the scenario i have.
A current user was having full access, now due to some circumstances, he is not allowed to delete any files/folders . I want to implement such that he is not able to delete any files/folders but yet be able to rename any file ( i have no issues with create,write,excute,read functionality).
A very manual workaround i found is for the user to create the file he needs on desktop and then rename it before putting it in the network drive(which he does not have delete permission). or even a save as different file name (multiple versions of same file argh!!!) or get another user to rename (argh argh argh!!!) ...
but these workarounds can't do .... all process workaround, wonder if there is a technical solution :p
wonder if the user has to just live with it or i can make his life easier.