Hi,
Kindly note that Q&A forum only supports English at this moment, if you prefer to working in French, you could post a new thread in the Technet Forum.
Link: https://social.technet.microsoft.com/Forums/Lync/es-es/home
I tried to understand your questions with Google translate and would like to share following info with you.
1.What kind of account that you are referring to? Any relevant MS product?
2.For MS account that forgot password, have you tried the steps listed below?
When you can't sign in to your Microsoft account
https://support.microsoft.com/en-us/account-billing/when-you-can-t-sign-in-to-your-microsoft-account-475c9b5c-8c25-49f1-9c2d-c64b7072e735
3.You could seek assistance to the Answers forum as indicated in below link: ask the community (scroll down to the bottom)
https://support.microsoft.com/en-us/account-and-billing
Hope this helps and please help to accept as Answer if the response is useful.
Thanks,
Jenny