This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Buscar en Ayuda

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Este tema ha sido archivado. Haz una nueva pregunta si necesitas ayuda.

Outlook 2019 and thunderbird

arkadiusz.szelagowskI
arkadiusz.szelagowskI
more options

maybe someone will help me, I use thunderbird version 78 on windows 10 pro, I have the impression that every time I start my computer, outlook (from office 2019) sets itself as the default client. I delete "HKEY_CURRENT_USER \ Software \ Clients \ Mail" Outlook keys in the registry, but new ones keep appearing. The default client itself also changes. How do I block it? Outlook alone cannot be uninstalled. I have thunderbird set as my default client wherever I can but that doesn't help. I tried to install office without outlook but failed. please help.

maybe someone will help me, I use thunderbird version 78 on windows 10 pro, I have the impression that every time I start my computer, outlook (from office 2019) sets itself as the default client. I delete "HKEY_CURRENT_USER \ Software \ Clients \ Mail" Outlook keys in the registry, but new ones keep appearing. The default client itself also changes. How do I block it? Outlook alone cannot be uninstalled. I have thunderbird set as my default client wherever I can but that doesn't help. I tried to install office without outlook but failed. please help.
Capturas de pantalla adjuntas

Todas las respuestas (2)

Toad-Hall
Toad-Hall
  • Top 10 Contributor
more options

HKEY_CURRENT_USER \ Software \ Clients \ Mail Set Default Data: Mozilla Thunderbird

But....what do you have here: HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail It is possible you have 'PackagedMail' set as the default and that is Outlook. Change default to Mozilla Thunderbird


In Windows Search type : default and choose 'Default apps' Email should say Thunderbird

scroll down and click on 'choose default applications by protocol ' MAILTO should say Thunderbird

arkadiusz.szelagowskI
arkadiusz.szelagowskI Autor de la pregunta
more options

Everything is consistent with what you wrote. The problem is that every few days a process or service changes the default mail client in the registry and adds new Outlook keys in the registry. For now I have manually deleted Outlook files and it's been ok for 4 days. I haven't figured out what causes the default client change yet, I suspect some windows updates or internal office processes.