Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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.
Solved Archivado

Thunderbird by POP doesn´t syn with Microsoft server

Thunderbird Connectivity
Miguel replied
Miguel
Miguel

Today, Thunderbird is not syncing with the Office server. Accounts configured as POP. This happens to all accounts on all computers.

The RETR command was not completed successfully. Error retrieving the message. The mail server outlook.office365.com responded: Server Unavailable. 21

Today, Thunderbird is not syncing with the Office server. Accounts configured as POP. This happens to all accounts on all computers. The RETR command was not completed successfully. Error retrieving the message. The mail server outlook.office365.com responded: Server Unavailable. 21

Todas las respuestas (1)

Miguel
Miguel Autor de la pregunta

Solución elegida

After 24h, It seems that everything is working again. I suppose Microsoft has fixed its error. Thanks