17A-005o contains a new version of CARD with support for both regular and SFS files under CMS release 6 and 7. Older versions of CMS are, of course, still supported without requiring re-assembly. However, support for CDF minidisks had to be removed in order to make room for the new code and the self-NUCXLOAD bootstrap. This does not affect LISTSERV, since it never supported CDF in the first place, but it is worth mentioning as many sites use the LISTSERV version of CARD for other purposes. Note that IBM removed CDF support in CMS release 7 anyway. If you are not using CMS release 6 or 7, you do not need to install that fix now; it will be included in the release 1.7b update. Eric