Tim Streater wrote:
On 16 Apr 2021 at 09:26:50 BST, polygonum_on_google
wrote:

On Friday, 16 April 2021 at 08:50:03 UTC+1, SH wrote:

2. Your email client will have a PST file containing *all* your emails,
email addresses, email contents etc.
Many of us have not one single .pst file. (I have one - which is an file last written in 2012! I think I might have used it to recover something or other.)

What is a .pst file?


https://en.wikipedia.org/wiki/Personal_Storage_Table

"The .pst file format is supported by several
Microsoft client applications, including... Microsoft Outlook"

"Outlook 2002 and earlier use ANSI (extended ASCII with a codepage)
encoding. This format has a maximum size of 2 GB (2^31 bytes) and
does not support unicode.

From Outlook 2003 and onward, the new standard format for .pst
is Unicode (UTF-16 little-endian), with 64-bit pointers. The
limit became 20 GB for Outlook 2003-2007, and increased to
50 GB from Outlook 2010.
"

It's an awful kind of storage container. It's possible it
holds multiple mailboxes.

libpst - a little too low level maybe

https://www.five-ten-sg.com/libpst/rn01re06.html

Example of contents:

"The default folders within a pst-file for a POP3 account are;

Inbox
Drafts
Outbox
Sent Items
Deleted Items
Junk Email
Search Folders
RSS Feeds
Calendar
Contacts
Suggested Contacts (Outlook 2010 only)
Tasks
Notes
Journal
"

Paul