Shoutbox

Error codes courtesy of msgrua.h:
MSGR_E_CONNECT    = 0x81000300 + 0x1,
MSGR_E_INVALID_SERVER_NAME    = 0x81000300 + 0x2,
MSGR_E_INVALID_PASSWORD    = 0x81000300 + 0x3,
MSGR_E_ALREADY_LOGGED_ON    = 0x81000300 + 0x4,
MSGR_E_SERVER_VERSION    = 0x81000300 + 0x5,
MSGR_E_LOGON_TIMEOUT    = 0x81000300 + 0x6,
MSGR_E_LIST_FULL    = 0x81000300 + 0x7,
MSGR_E_AI_REJECT    = 0x81000300 + 0x8,
MSGR_E_AI_REJECT_NOT_INST    = 0x81000300 + 0x9,
MSGR_E_USER_NOT_FOUND    = 0x81000300 + 0xa,
MSGR_E_ALREADY_IN_LIST    = 0x81000300 + 0xb,
MSGR_E_DISCONNECTED    = 0x81000300 + 0xc,
MSGR_E_UNEXPECTED    = 0x81000300 + 0xd,
MSGR_E_SERVER_TOO_BUSY    = 0x81000300 + 0xe,
MSGR_E_INVALID_AUTH_PACKAGES    = 0x81000300 + 0xf,
MSGR_E_NEWER_CLIENT_AVAILABLE    = 0x81000300 + 0x10,
MSGR_E_AI_TIMEOUT    = 0x81000300 + 0x11,
MSGR_E_CANCEL    = 0x81000300 + 0x12,
MSGR_E_TOO_MANY_MATCHES    = 0x81000300 + 0x13,
MSGR_E_SERVER_UNAVAILABLE    = 0x81000300 + 0x14,
MSGR_E_LOGON_UI_ACTIVE    = 0x81000300 + 0x15,
MSGR_E_OPTION_UI_ACTIVE    = 0x81000300 + 0x16,
MSGR_E_CONTACT_UI_ACTIVE    = 0x81000300 + 0x17,
MSGR_E_PRIMARY_SERVICE_NOT_LOGGED_ON    = 0x81000300 + 0x18,
MSGR_E_LOGGED_ON    = 0x81000300 + 0x19,
MSGR_E_CONNECT_PROXY    = 0x81000300 + 0x1a,
MSGR_E_PROXY_AUTH    = 0x81000300 + 0x1b,
MSGR_E_PROXY_AUTH_TYPE    = 0x81000300 + 0x1c,
MSGR_E_INVALID_PROXY_NAME    = 0x81000300 + 0x1d,
MSGR_E_NOT_LOGGED_ON    = 0x81000300 + 0x1e,
MSGR_E_NOT_PRIMARY_SERVICE    = 0x81000300 + 0x20,
MSGR_E_TOO_MANY_SESSIONS    = 0x81000300 + 0x21,
MSGR_E_TOO_MANY_MESSAGES    = 0x81000300 + 0x22,
MSGR_E_REMOTE_LOGIN    = 0x81000300 + 0x23,
MSGR_E_INVALID_FRIENDLY_NAME    = 0x81000300 + 0x24,
MSGR_E_SESSION_FULL    = 0x81000300 + 0x25,
MSGR_E_NOT_ALLOWING_NEW_USERS    = 0x81000300 + 0x26,
MSGR_E_INVALID_DOMAIN    = 0x81000300 + 0x27,
MSGR_E_TCP_ERROR    = 0x81000300 + 0x28,
MSGR_E_SESSION_TIMEOUT    = 0x81000300 + 0x29,
MSGR_E_MULTIPOINT_SESSION_BEGIN_TIMEOUT    = 0x81000300 + 0x2a,
MSGR_E_MULTIPOINT_SESSION_END_TIMEOUT    = 0x81000300 + 0x2b,
MSGR_E_REVERSE_LIST_FULL    = 0x81000300 + 0x2c,
MSGR_E_SERVER_ERROR    = 0x81000300 + 0x2d,
MSGR_E_SYSTEM_CONFIG    = 0x81000300 + 0x2e,
MSGR_E_NO_DIRECTORY    = 0x81000300 + 0x2f,
MSGR_E_RETRY_SET    = 0x81000300 + 0x30,
MSGR_E_CHILD_WITHOUT_CONSENT    = 0x81000300 + 0x31,
MSGR_E_USER_CANCELLED    = 0x81000300 + 0x32,
MSGR_E_CANCEL_BEFORE_CONNECT    = 0x81000300 + 0x33,
MSGR_E_VOICE_IM_TIMEOUT    = 0x81000300 + 0x34,
MSGR_E_NOT_ACCEPTING_PAGES    = 0x81000300 + 0x35,
MSGR_E_EMAIL_PASSPORT_NOT_VALIDATED    = 0x81000300  + 0x36,
MSGR_E_AUDIO_UI_ACTIVE    = 0x81000300 + 0x37,
MSGR_E_NO_HARDWARE    = 0x81000300 + 0x38,
MSGR_E_PAGING_UNAVAILABLE    = 0x81000300 + 0x39,
MSGR_E_PHONE_INVALID_NUMBER    = 0x81000300 + 0x3a,
MSGR_E_PHONE_NO_FUNDS    = 0x81000300 + 0x3b,
MSGR_E_VOICE_NO_ANSWER    = 0x81000300 + 0x3c,
MSGR_E_VOICE_WAVEIN_DEVICE    = 0x81000300 + 0x3d,
MSGR_E_FT_TIMEOUT    = 0x81000300 + 0x3e,
MSGR_E_MESSAGE_TOO_LONG    = 0x81000300 + 0x3f,
MSGR_E_VOICE_FIREWALL    = 0x81000300 + 0x40,
MSGR_E_VOICE_NETCONN    = 0x81000300 + 0x41,
MSGR_E_PHONE_CIRCUITS_BUSY    = 0x81000300 + 0x42,
MSGR_E_SERVER_PROTOCOL    = 0x81000300 + 0x43,
MSGR_E_UNAVAILABLE_VIA_HTTP    = 0x81000300 + 0x44,
MSGR_E_PHONE_INVALID_PIN    = 0x81000300 + 0x45,
MSGR_E_PHONE_PINPROCEED_TIMEOUT    = 0x81000300 + 0x46,
MSGR_E_SERVER_SHUTDOWN    = 0x81000300 + 0x47,
MSGR_E_CLIENT_DISALLOWED    = 0x81000300 + 0x48
MSGR_E_PHONE_CALL_NOT_COMPLETE    = 0x81000300 + 0x49,
MSGR_E_GROUPS_NOT_ENABLED    = 0x81000300 + 0x4a,
MSGR_E_GROUP_ALREADY_EXISTS    = 0x81000300 + 0x4b,
MSGR_E_TOO_MANY_GROUPS    = 0x81000300 + 0x4c,
MSGR_E_GROUP_DOES_NOT_EXIST    = 0x81000300 + 0x4d,
MSGR_E_USER_NOT_GROUP_MEMBER    = 0x81000300 + 0x4e,
MSGR_E_GROUP_NAME_TOO_LONG    = 0x81000300 + 0x4f,
MSGR_E_GROUP_NOT_EMPTY    = 0x81000300 + 0x50,
MSGR_E_BAD_GROUP_NAME    = 0x81000300 + 0x51,
MSGR_E_PHONESERVICE_UNAVAILABLE    = 0x81000300 + 0x52,
MSGR_E_CANNOT_RENAME    = 0x81000300 + 0x53,
SGR_E_CANNOT_DELETE    = 0x81000300 + 0x54,
MSGR_E_INVALID_SERVICE    = 0x81000300 + 0x55,
MSGR_E_POLICY_RESTRICTED    = 0x81000300 + 0x56

Edit: Wow, that's a lot...