Dear Uwe and all, First of all, I want to congratulate you for your dedication in providing and maintaining R for 64bit operating systems. I tried the 64bit version of R, under a windows server 2003 system. It seems to work properly, but am concerned since I need to use the package "fields", which depends on the package "spam", which seems to have a check error. I know 64bit versions of R and its packages are just starting to roll, but I wonder if there's a possibility of making the "spam" package working on 64bit R. From what I saw in the log file ( http://www.statistik.tu-dortmund.de/~ligges/CRAN/bin/windows64/contrib/r-devel/check/spam-check.log) it seems to be a problem with tests. Is it possible to run the R CMD check for the "spam" package with the --no-tests flag? By the way, the "fields" package was built using the --no-tests flag Many thanks for any help you might be able to provide, Julian Ramirez Research Assistant International Centre for Tropical Agriculture, CIAT Colombia [[alternative HTML version deleted]]