Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

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

POP emails automatically marks read in office365 webpage after been fetched in thunderbird

  • 1 respuesta
  • 1 tiene este problema
  • 1 visita
  • Última respuesta de Toad-Hall

more options

I have an office365 email account set up in thunderbird using POP server/ settings : Server name: outlook.office365.com ; Port: 995 ; Encryption method: TLS/SSL

Everything works normal but only one issue. When new emails are retrieved in thunderbird, it automatically marks the email read in office365 webpage.

The new email received in thunderbird still remains unread until I read it but the emails in the webpage of office 365 automatically marks read.

Please is this normal or some kind of bug with thunderbird? or compatibility issue between thunderbird and office365? I thought the emails received with POP leaves emails in the webclient unread

Or are there some settings I can use to prevent this from happening ?

I have an office365 email account set up in thunderbird using POP server/ settings : Server name: outlook.office365.com ; Port: 995 ; Encryption method: TLS/SSL Everything works normal but only one issue. When new emails are retrieved in thunderbird, it automatically marks the email read in office365 webpage. The new email received in thunderbird still remains unread until I read it but the emails in the webpage of office 365 automatically marks read. Please is this normal or some kind of bug with thunderbird? or compatibility issue between thunderbird and office365? I thought the emails received with POP leaves emails in the webclient unread Or are there some settings I can use to prevent this from happening ?

Solución elegida

re :The new email received in thunderbird still remains unread until I read it but the emails in the webpage of office 365 automatically marks read.

Thunderbird has no control over the webmail account with the exception of selecting not to auto delete off server. Pop accounts can only access and download from server Inbox. It is usual for emails to be deleted off server after being popped, but if you have a setting in Account Settings to 'Leave message on server' then it will not be deleted off server. It is not possible for Thunderbird to mark anything as read or not read in the webmail account. However, for a few years there has been many reported cases that Outlook.com automatically mark popped emails as read. POP assumes you have read the emails because they were downloaded regardless of whether you have actually read them or not. These are a couple of examples:

When an email client that uses the POP protocol (such as an email app on a cell phone) fetches new (unread) email from the new outlook.com interface (which runs Exchange servers), the Exchange servers mark that mail (on the server) as being read (even if those email messages were never opened by the user). The old outlook interface's servers did not do this ... the old servers left the fetched mail (on the server) marked as being unread.

The new Outlook Mail interface is not backwards compatible with the old interface. Many customers have complained about this .... both here in Microsoft Community and on the uservoice site .... but so far Microsoft has not done anything to fix it.


Try this: go to the outlook.com webpage, see if there is something under Mail Settings "mark as read" section, you are looing for something like "Don't automatically mark items as read".

Leer esta respuesta en su contexto 👍 0

Todas las respuestas (1)

more options

Solución elegida

re :The new email received in thunderbird still remains unread until I read it but the emails in the webpage of office 365 automatically marks read.

Thunderbird has no control over the webmail account with the exception of selecting not to auto delete off server. Pop accounts can only access and download from server Inbox. It is usual for emails to be deleted off server after being popped, but if you have a setting in Account Settings to 'Leave message on server' then it will not be deleted off server. It is not possible for Thunderbird to mark anything as read or not read in the webmail account. However, for a few years there has been many reported cases that Outlook.com automatically mark popped emails as read. POP assumes you have read the emails because they were downloaded regardless of whether you have actually read them or not. These are a couple of examples:

When an email client that uses the POP protocol (such as an email app on a cell phone) fetches new (unread) email from the new outlook.com interface (which runs Exchange servers), the Exchange servers mark that mail (on the server) as being read (even if those email messages were never opened by the user). The old outlook interface's servers did not do this ... the old servers left the fetched mail (on the server) marked as being unread.

The new Outlook Mail interface is not backwards compatible with the old interface. Many customers have complained about this .... both here in Microsoft Community and on the uservoice site .... but so far Microsoft has not done anything to fix it.


Try this: go to the outlook.com webpage, see if there is something under Mail Settings "mark as read" section, you are looing for something like "Don't automatically mark items as read".