We're running Classic, we only need to send one message to this list. It may however be a reason to upgrade, whats the theoretical limit for announce lists on Classic? the information on the link you provided seems to suggest that Classic is capable, albeit panting a bit at those levels. Cheers Nathan, Damon. -----Original Message----- From: LISTSERV give-and-take forum [mailto:[log in to unmask]]On Behalf Of Nathan Brindle Sent: Tuesday, July 25, 2000 3:57 PM To: [log in to unmask] Subject: Re: Large ADD Are you running LISTSERV HPO? If not I can imagine plain LISTSERV Classic taking a long time to add 100K users. It doesn't look to me like you have an HPO LAK, at least as far as I can tell from the records. For a fairly graphic description of the difference, see http://www.lsoft.com/products/default.asp?item=listserv_perf Nathan