Recently purchased new computer with windows 10. Now notice my emails are received on both i phone and PC as usual, but when I delete emails on either one they do not delete on the other one??
Windows 10 hasn't screwed up your iPhone, in my opinion. You simply have a sync issue, and the problem could be a setting or a problem on the email server's side. If you delete an email via your email account's website, does the deletion immediately sync to your PC or your iPhone?