Server is running on Domino 6.5/Windows2003. Clients are running on Notes 6.5/Windows98. I have googled the web and this, but I haven’t found the reported error.
Subject: Error logging in to instant messaging: Instant messaging internal allocation error.
Unable to use Notes IM on Notes Release 6.5.5 running on Windows 98http://www-1.ibm.com/support/docview.wss?uid=swg21249535