Thanks, mooms and Jan. I plan to upgrade my SSD to 1TB so I can do a dual-boot, and that won't be for probably another month (I'm in the middle of a couple of projects that can't be put on hold while I tinker), so the new update should be out by then.
Good to know Win 10 runs fine on the M4600, there was some contradictory information out there on the www about that. And it will be great if the Win 7 product key gets me free Windows 10 -- but I thought from way back when, that it was an either-or deal? You could use the key either on Win 7 or on Win 10, but not both? Or was that an earlier upgrade deal? And with Win 7 no longer supported, does it matter? It's not like I care if Win 7 updates are blocked, since there aren't any, any more.
M4600 service tag is 5691MQ1. Express Service Code is 11261901385.
T5500 service tag is 4WLJYQ1. Express Service Code is 10678250377.
Rebeccah