You can't just "plug" a hard drive in to another computer. If it is an external hard drive with a USB then yeah you can do that. As for taking the hard drive out and putting in to a new computer it will have to match up. It has to be compatible. And if it is your hard drive that is the issue it doesn't matter where you put it. A hard lesson but photos and really important stuff you need to back up to either disks or an external hard drive. Seagate makes them. You can get a 1 or 3 terabyte at Walmart. And if it is really important I would back it up to 2 different ones.
I already have a Seagate drive. it stopped working and when I asked Seagate support, they said they don't support this drive anymore (had it for a year or two) AND it will no longer backup my hard drive because they don't support my computer. I had gotten this Seagate thinking I'd never have to worry about my info anymore. Boy, was I wrong!!!!!
I would take both your computer and your son's to a professional and have them transfer it all over. Also look into getting an external hard drive.
Last time I did anything with a professional it cost me $200 just to set up my laptop with an operating system with the F1-F2 procedures and options, and their logo. There is no Geek Squad OR Best Buy around here. All we have is Walmart and/or Staples. i once had a guru but he stopped keeping up once technology got out of control (about 5 years ago), so I'm really on my own. Staples had advertised support for computers but only for those they sold. When I called about other ones, the "tech" guy had no idea what I was even talking about...duh!
As for plugging in a hard drive to another computer. I've done it every time I bought a new computer and never had a problem and since my son's computer is the same as mine, I'm sure there would be no problem. But, do I want to do that?
I have forgotten about flashdrives. If it's what I'm thinking, are they the small doohickeys you plug into the USB and download your stuff?
BTW, I finally did get Outlook to work but it wasn't the same as before. It looked and acted totally different. So i kept checking and bingo! Realized the one I've been using all this time was Microsoft Office Outlook. So, I found my address book and my folders but I still can't send and receive. I've got more work to do on this end. My genealogy data is useless since it's read only. I don't know what to do about that. Erase and reformat and try again (No one can ever say I'm not a glutton for punishment).
I'm also going to look into the Amazon link OldBuddy sent.
I would love it if i could get my son's computer to change the screen size. He couldn't do it. It just wouldn't change. I'll have 3 computers here that will no longer work. I was working towards getting a power supply for the other Dell (which is #1''s problem) until #2 started acting up. Sheesh! Never ends.
Thanks everyone for your help. i think i might be able to get this fixed now. Temporarily, i'm use OE6 to send and receive but don't want to wait much longer before my important emails wind up trashed.