In addition to what Mentality said, MemoServ is really nothing more than a bot with special usermodes/privileges on certain servers. With this in mind it makes it impossible for mIRC to use it for a number of reasons:

  • Not all servers with a memo service use the name 'MemoServ' for the bot.
  • There is no standard to how MemoServ works - it's commands can (and do) vary completely from one server to the next.
  • While some servers which don't use a 'MemoServ' bot explicitly forbid that nickname to prevent abuse, it's certainly not universal. MemoServ might exist on a server but be a regular user, meaning if mIRC tried to automatically detect and utilise it it would be a massive security issue.