Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//usr/share/doc/evolution-data-server/README.Debian

 Evolution for Debian
====================

IMAP
----

In versions prior to 2.8, two different IMAP providers (backend modules)
were installed. "IMAP" was considered more stable and "IMAP4rev1" had a
few experimental features. Starting with version 2.8, IMAP4rev1 has been
removed. All accounts with IMAP4rev1 set as server type for incoming
email must be switched to IMAP.

Mailbox corruption
------------------

Mailbox summary corruption is an issue that is known to appear in
exceptional cases as reported in http://bugs.debian.org/295270 and
http://bugs.debian.org/347703. A typical symptom is the error message:
"Error while Refreshing folder: Summary and folder mismatch, even after
a sync." No data is lost, but one or more summary files are corrupted.

Before fixing the problem, backup your ~/.evolution folder just in case.
Delete ~/.evolution/mail/local/MAILBOX.ev-summary where MAILBOX is your
mailboxes. For example, the inbox summary file is Inbox.ev-summary. To
rebuild the summaries, restart evolution and evolution-data-server.