Without a parameter, displays information on the number of memos you have, how many of them are unread, and how many total memos you can receive.
With a channel parameter, displays the same information for the given channel.
With a nickname parameter, displays the same information for the given nickname. (This is limited to Services Operators.)
/MS info [nick | channel]
/msg MemoServ INFO
/msg MemoServ INFO #myChannel