Thank you for all the interesting information regarding Mozilla etc.
Martin - it's Thunderbird I'm having problems with perhaps because I use gmail. I can get it up on my laptop but it just doesn't work, a little blue circle just keeps going round and round and etc. I also get a message which states:
Authentication failure while connecting to server imap.gmail.com
I went on line to see if there was anything I could do to fix this problem and despite trying many supposed fixes, nothing works. People have been having the problem for over 2 years but it seems it has been worse since both Mozilla and Thunderbird updated late last year, although the problem only started with me a couple of days ago. So if Thunderbird still works for you, then I think you are one of the lucky ones.
Anyway, I've now downloaded Chrome and I have Gmail as a tab so at least I can view my emails without having to keep logging in to Google. I have all the files showing that I save some emails too until I've decided where else to put them, or until whatever I'm working on has been finished. However, what I can no longer do is "Save As" and actually save the emails to folders in My Documents. Now, even though an email is open, it will only save as a complete web page - which is better than nothing I suppose.