Returns the number of messages the user has written

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See also: U_Bdl, U_BdlDay, U_Bul, U_Fdl, U_Ful, U_InConf, U_LDate, U_LDir, U_Lmr, U_Logons, U_LTime, U_MsgRd, U_Name, U_PwdHist, U_PwdLc, U_PwdTc, U_RecNum, U_Stat, U_TimeOn