[Akonadi] [Bug 354807] New: KMail 15.08.2 is resyncing Outlook365 IMAP Folders all over again after restart

[Martin Kostolný via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=354807

            Bug ID: 354807
           Summary: KMail 15.08.2 is resyncing Outlook365 IMAP Folders all
                    over again after restart
           Product: Akonadi
           Version: unspecified
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: IMAP resource
          Assignee: chrigi_1 at fastmail.fm
          Reporter: clearmartin at zoho.com
                CC: kdepim-bugs at kde.org, vkrause at kde.org

After fixing this bug https://bugs.kde.org/show_bug.cgi?id=351814 everything is
working correctly until reboot.

When system is restarted akonadi starts to resync all IMAP folders again - so
their content disappears and is all being loaded again. Sometimes with all
messages marked as unread. Anyway this renders these e-mails unavailable for a
couple of minutes (depends on the number of e-mails and on bandwidth).

After this moment or maybe after another restart this IMAP resource starts to
be unusable because after repeated synchronization starts another
synchronization - at some point it is an endless process.

This issue is only valid for Office365 IMAP resource.

Reproducible: Always

Steps to Reproduce:
1. Setup Office365 IMAP resource and wait for everything to sync
2. Reboot computer
3. Open up kmail, click e.g. on INBOX folder and observe

Actual Results:  
All is being synchronized again. E-Mails are disappearing and appearing again.

Expected Results:  
Only new changes should be synchronized.

I Have: Plasma 5.4.2, KF 5.15, KDE Applications 15.08.2, Qt 5.5.1, akonadi
5.0.51

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