223822 - "daylight savings time": Unread / duplicate mails after system sets clock back 1 hour

Status: RESOLVED DUPLICATE of bug 136049

(MailNews Core :: Database, defect)

Description

[Stefan Kuhn]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007

After the end of the "daylight savings time" period, when the OS automatically
sets back the clock one hour, mail/news summary files seem to be invalid /
corrupt. Most (but not all) msgs show up as "unread" again, if pop3 is set to
"leave messages on server", mails are again downloaded, causing many unread
duplicates. View settings for folders (e.g. sorting by date
ascending/descending) are wrong (reset to default?).

Reproducible: Couldn't Reproduce

Steps to Reproduce:
Due to the "nature" of the "Daylight savings time" automatic adjustment of the
system time happens only twice a year (in countries that apply this...).
Manually setting the time +/- 1 hour is not suitable to reproduce the problem.
The OS does more than just setting the current time +/- 1 hour.
Actual Results:  
Most (but not all) msgs show up as "unread" again, if pop3 is set to "leave
messages on server", mails are again downloaded, causing many unread duplicates.
View settings for folders (e.g. sorting by date ascending/descending) are wrong
(reset to default?).

Expected Results:  
Keep track which msgs were marked "Read" and keep the folder view settings after
the OS has adjusted the system time.
Keep track which msgs were already downloaded from pop3 server and not download
them again.

Comment 1

[Matthias Versen [:Matti]]

*** This bug has been marked as a duplicate of 136049 ***