The first thing to understand is the difference between an online program (such as the Yahoo website) and a program running locally on your computer. Then I can point you in the right direction.
When you create a backup image of your machine, it contains everything; that’s the definition of a backup image.
Outlook is doing the best that it can with spam, but your expectations that it can block spam based on the From addresses is a tad off the mark.
Without a doubt, having lots of tabs open can impact a computer’s speed. Whether or not it slows down the entire network will depend on exactly what all those tabs are doing.
Constantly writing to an SD card will shorten its life. The question is how much? That’s going to depend on several factors.
Installing a new operating system wipes the old files out with no path for reconstruction. I’ll give you three options for moving forward.
Most of these major email providers are doing what I would call behavioral analysis. They’re looking for signals that indicate spam and then posting a CAPTCHA.
Unfortunately, there is no practical way to determine what is and what isn’t personal information. Securing a computer to give away is an all-or-nothing proposition.