She has an ISP email address which is used from the desktop and a gmail address which she uses on the laptop. She's asked me if she can use the ISP address on the laptop.
Clearly the simple answer is yes. ButÖ
So her ISP emails are held on the client and not on the web. The problem, as I see it, is that using the laptop for ISP emails would have one (or perhaps both) of two problems.
If she uses MS Office Outlook on the laptop then and emails sent and received on the laptop would be held on the laptop Ė and vice versa for the desktop. Even if the laptop was set not to delete emails from the server so that such emails would also appear on the desktop, emails she sends from the laptop would not be get to the desktop.
If she uses web mail from the laptop then the desktop would have no knowledge of emails sent.
I donít know if thereís any way of synchronising the Sent Items box. I donít know whether using IMAP emails rather than POP3 would give any benefit.
Though not certain but I'm assuming that she wouldn't be using both PCs at essentially the same time.
And no, she won't change from using her ISP Email address. She's knows the downsides if she ever changes her ISP so it's not worth even trying to go down that path.
Happily running Windows 10 Pro on both desktop and laptop
We have more and more laws, and less and less enforcement