PAX OP; UNAUTH TKOF IN IMC CONDITIONS.

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THE FLT WAS CLRED INTO POS AND HOLD. RAN RWY CHKLIST. L PITOT HEAT ANNUNCIATION LIGHT STAYED ON. ASKED FOR AND RECEIVED CLRNC TO TAXI OFF RWY TO FIX PROB. THE CREW RADIOED BOS OPS FOR A MEL NUMBER. THE CREW MEL'D THE FAULTY PITOT HEAT UNIT. I (THE CAPT) WAS AWARE OF THE RESTRICTION OF NO KNOWN OF FORECAST ICING WITH THIS UNIT INOP; SO I NEGLECTED TO LOOK AT THE MEL BOOK FOR OTHER RESTRICTIONS. THERE WAS ONE OTHER RESTRICTION; THAT WHICH PROHIBITED IFR PAX CARRYING OPS. WE DEPARTED THROUGH A 1000 FT THICK OVCST IN BOSTON; FLEW IN VISUAL CONDITIONS IN AN INVERSION. TEMP ALOFT WAS PLUS 10 DEGS C AND SHOT AN IS APCH INTO ALBANY THROUGH A THIN OVCST INTO VFR CONDITIONS; IN VIOLATION OF THE MEL PROCS. UPON CALLING DISPATCH WHILE AIRBORNE; I WAS ADVISED OF THE ADDITIONAL OVERLOOKED RESTRICTION. I DECIDED THEN TO CHK THE MEL BOOK BECAUSE I WAS UNAWARE OF SUCH A RESTRICTION. UPON OPENING THE MEL BOOK; THE CREW DISCOVERED THAT SEVERAL PAGES OF THE MEL BOOK WERE MISSING; INCLUDING THE ONE WE NEEDED. THE WX IN ALBANY WAS RPTED VFR. CONSIDERING THE SAFETY OF THE FLT; THE CREW OPTED TO CONTINUE TO ALBANY AS THE LOCAL WX IN THE BOSTON AREA WAS IFR. THE PROB AROSE BECAUSE OF THE CAPT'S NEGLECT TO CHK THE MEL BOOK PRIOR TO FLT. ADDITIONALLY THE CAPT IS DUAL QUALIFIED IN ANOTHER TYPE LTT IN WHICH AN INOP PITOT HEATER IS ALLOWABLE. THIS CONFUSION BECAUSE OF DUAL QUALIFICATION LED TO THIS EPISODE. IF PROPER PROCS AS OUTLINED IN THE COMPANY OPS SPECS HAD BEEN ADHERED TO; THE MISSING MEL PAGES WOULD HAVE BEEN DISCOVERED AND THE FLT WOULD NOT HAVE DEPARTED. ADDITIONALLY; I SUGGEST TO THE COMPANY; IN THE MEL PROCESS TO HAVE THE FO READ THE MEL; SAY THE RESTRICTIONS; LET THE PIC READ THE MEL AND MAKE AN INFORMED DECISION AS A CREW AS HOW TO PROCEED WITH THE MEL PROCESS.