I've done a 'cut and paste' job from another thread in order to answer this question:
Diarist can you confirm what she is supposed to called. Should she be called The Duchess or is it Sarah? I thought it was now supposed to be Sarah Ferguson, Duchess of York. But everyone who interviews her still calls her The Duchess. It drives me crazy!
The correct form of address for the former wife of a Duke is quite simply 'Madam'. This is NOT abbreviated to 'Ma'am' (which is correctly only used when addressing the Queen and Royal Highnesses.)
I think that the reason why interviewers address Sarah as ''Duchess'' stems from the fact that the correct way to address a [non-royal] Duchess who is still married to (i.e. not divorced from) her ducal husband is 'Duchess'. This sounds strange to many of us, as of course one does not address the wife of an Earl as 'Countess'. But there you have it, the correct way to address a married duchess is 'Duchess', [just as the correct way to address her husband is 'Duke'; yes, honestly, this is true]. There is however one slight refinement to this: an
employee will address his or her ducal master or his wife as 'Your Grace'.] Nowadays, even after a divorce,
socially some people do
continue to address the divorced duchess as 'Duchess', but the correct formal form of address is 'Madam'.
Since Sarah's 'title usage' [as I should call it] takes place in a business context [i.e. not a
social context] I think that she should only ever be called 'Madam'.
One point that I should mention here is this; when considering the correct way to address any divorcee, consideration should ALSO always be given to what titles they themselves bear; Sarah is the daughter of a 'gentleman' and so she bore no title before her marriage. Sometimes in England, you find a divorced wife of a Duke calling herself (say) 'Lady Helen Smith'. Before automatically thinking this is wrong, check carefully: Lady Helen could have been the daughter of a Duke, a Marquess or an Earl herself!! Therefore, on her divorce from the Duke, Instead of styling herself Helen, Duchess of Wherever, she is quite entitled to revert back to her own ''style''.
Finally, if it is any of any consolation, titles confuse nearly everyone in England; even the Royal Family, come to that, for George VI, when granting Prince Philip the Title of 'Duke of Edinburgh' presumed [wrongly] that he was also making him a Royal Prince. He was not, and the error had to be rectificed subsequently, otherwise Prince Charles could hav been born ony a Lord!!!
Hope this helps
Alex