Outlook 2019 & Xtramail

[king1]

Wainuitech, I can just copy the Data file,  .pst file and import it to MS Outlook (I have it set up in my Win11 PC), can access, view, etc.?

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Being POP, yes you can do it that way.

To stop Outlook from giving those access failures (the username password prompt) every 10 minutes or so then you need to remove the pop account from the mail settings.  The data file itself should stay in place but back it up anyway just in case, it is stored in documents / outlook files usually... Outlook would need to be closed to copy it...

This is the area you would do that 
https://filestore.community.support.micr...1e94c13bc1

File -> Account settings -> Account settings

If the xtramail account is removed or deleted, the folders like Inbox, Sent, etc associated with the account should stay in place?

With POP, yes, but backup just in case...