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configure pop on office 365

eg1995 1,136 Reputation points
2023-02-09T08:47:27.4466667+00:00

Hi team,

I need some clarifications on exchange online and POP configuration.

Pop is meant to download the incoming emails locally on the device, and in exchange online we can configure user settings to enable POP features.

questions

  • if this is enabled, will this mean that all incoming emails will be downloaded locally on user machines or this will need a 3rd party connector to do it? and what would be the default location?
  • will this also work outlook on the web or its just tied to outlook and other email client desktop apps
  • assuming that i am using security default, which will disable pop settings by default, can i keep security default enabled and then by pass the blocking by enabling pop settings inividually on selective users?

many thanks

Microsoft Exchange Online
Outlook
Outlook
A family of Microsoft email and calendar products.
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Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Yuki Sun-MSFT 41,016 Reputation points
    2023-02-10T07:20:07.72+00:00

    Hi @eg1995 ，

    • if this is enabled, will this mean that all incoming emails will be downloaded locally on user machines or this will need a 3rd party connector to do it? and what would be the default location?
    • will this also work outlook on the web or its just tied to outlook and other email client desktop apps
    • assuming that i am using security default, which will disable pop settings by default, can i keep security default enabled and then by pass the blocking by enabling pop settings inividually on selective users?
    1. You don't need a 3rd party connector. By default, POP3 clients will download all incoming messages from the email server to the local computer. But, you can typically configure a POP3 client like Outlook to keep copies of downloaded messages on the server. For instance, in Outlook, there would be a setting as follows:
      User's image The default location for the PST file in Outlook for Windows is usually the path below. You can also find it via File > Account Settings > Account Settings.
      C:\Users\UserName\AppData\Local\Microsoft\Outlook
    2. POP3 can be used for any email programs that support POP3 to connect to Exchange Online (for example, Mozilla Thunderbird). Outlook on the web is not included in it.
    3. No, it's not feasible.
    • I won't need a POP connector to download the emails locally
    • What would be the default location?
    • If i have MFA which is mandatory in my organization, there is no way to combine MFA and POP?
    • As per my knowledge as well, POP won't keep a copy of the emails on the server. Will this mean that it will be deleted from O365? which will prevent me in the future from using retention tags and ediscovery to search for items?
    1. Yes, no connector needed.
    2. As mentioned above, the default PST file for mainstreaming versions of Outlook for Windows is C:\Users\UserName\AppData\Local\Microsoft\Outlook
    3. No, as said earlier, I am afraid it's not feasible.
    4. With the deprecation of Basic authentication in Exchange Online, it's no longer supported to use POP to connect to Exchange Online in Outlook.
      "There is no plan for Outlook clients to support OAuth for POP and IMAP, but Outlook can connect use MAPI/HTTP (Windows clients) and EWS"

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  1. Carlos Solís Salazar 17,791 Reputation points MVP
    2023-02-09T12:39:38.3133333+00:00
    • if this is enabled, will this mean that all incoming emails will be downloaded locally on user machines or this will need a 3rd party connector to do it? and what would be the default location? Yes, it is possible, especially if you have Basic authentication active
    • will this also work outlook on the web or its just tied to outlook and other email client desktop apps The protocol POP is used by any third-party, even other mail servers
    • assuming that i am using security default, which will disable pop settings by default, can i keep security default enabled and then by pass the blocking by enabling pop settings inividually on selective users? If you have Modern Authentication and/or MFA active, it won't be possible to use the protocol POP

    Hope this helps,

    Accept Answer and Upvote, if any of the above helped, this thread can help others in the community looking for remediation for similar issues.

    NOTE: To answer you as quickly as possible, please mention me in your reply.

  2. eg1995 1,136 Reputation points
    2023-02-10T05:07:53.48+00:00

    Carlos Solís Salazar I have added the comment under your reply :)

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