Long ago, it was possible to just walk into a courthouse and have them pull a file and you could look at it no questions asked - no papework to fill out to look. I obtained access to a probate file from 1885 when I was in Cambridge back in the 1970's that way. Not too long ago, I was able to email someone over at the Worcester County Probate Court and asked about an 1868 probate file that I had the file number from from ancestry.com. I did get a reply that indicated that that file was not available at the main office but that I could request it and it would take some days for them to retrieve it. Then they would let me know how many pages there were and since I was out of town, they were willing to copy the file and then mail it to me for a fee. It sounded as though, at that time, Worcester County had a records center somewhere out in Leicester or that vicinity that held their older records. I can't remember the exact details but I did get copies of everything I wanted from that one email and once I mailed the check for the copying fee.
Looking on their site now, there is no email listed at all.
http://www.mass.gov/courts/courtsandjudges/courts/worcesterprobmain.html You could call but make sure you are talking to someone who is knowledgeable.
It appears from the Mass Archives site that the earlier Worcester Probate records may well be at the Mass Archives in Boston. This link has the exact address to write to:
http://www.sec.state.ma.us/arc/arccol/colidx.htm#court The key to getting any of these is the Probate or other court file number.
Finally, since I am no longer in Massachusetts, I have asked the generous people from RAOGK as well as this board to assist and have been helped many many times. This is the link for Worcester County help: h
ttp://www.raogk.org/massachu2.htmThe Mormons have put some of the Probate records for Vermont online so you can see the whole file. I am hopeful that maybe they will tackle Massachusetts at some time.