It is my Outlook email account which I have been able to restore; the one I cannot get back is Yahoo, or to be precise BT Yahoo as supplied by my ISP. I have tried to get help from my ISP but it seems to be beyond them, the MS Chat Service won't open now but when it did it disconnected part way through, and I am awaiting replies from MS Community.

If I went down the route of uninstalling / reinstalling Mail itself, would I loose all my conversations in the three accounts I use, namely Outlook, Google, BTYahoo?