I've confirmed and reported issues to Microsoft in my environment with the
Microsoft 928388 Daylight savings patch and Outlook 2003 appointments, where
they appear time shifted one hour, when viewed on a computer with Outlook
2003 with the patch and a computer with Office 2003 without the patch. The
same is true when viewing appointments on Outlook 2003 with the patch and
Outlook XP (regardless of patch level).
Appointments appear offset by an hour for the time period in March
by the advance in daylight savings time, but I suspect more issues to be at
play, and I'm still looking into this. I would suggest holding off any
further deployment for as long as is necessary, or at least until Microsoft
can report the full ramifications of this patch in a mixed environment and
release a warning (or better yet, pull the patch and releasing one without
A quick test to see this would be to create a 12 noon repeating appointment,
running from Jan 1, 2007 to Dec 31, 2007 and view the same mailbox calendar,
especially around the DST "adjustment" period, March 11 to April 1, 2007, and
you'll also see differences between an unpatched 2003 Client (or Outlook XP)
and a Outlook 2003 client on a patched Windows XP machine. There is no
Windows 2000 patch I'm yet aware of, so I couldn't test that OS scenario.
To err on the side of caution, all
clients connecting to the same mailbox
should be on the same Office Version AND the same patch level to view correct
appointment times, and all clients connecting to the same mailbox should all
be updated at the same time.
The Exchange Server Message Store contains calendar items in
Zulu/UTC time, and I believe time translation is done at the client level,
within the OS (hence the effect of the patch) and can also be done within
Outlook's time zone setting option (which may well prove to need its own
I'm been made aware of a tool Microsoft is developing to run against the
desktop Outlook client to correct daylight savings time appointment issues. I
understand this tool will be similar to a new feature contained within
Outlook 2007. The Calendar item I'm seeing seems specific to Outlook 2003 AND
the Windows XP 928338 patch, and not to Outlook XP regardless of the patch.
However, I can't see how a tool would work, given the confusion some of us
are seeing when appointments are changed by several people, on different
Outlook versions, and different computers with, and without, the 928388 patch.
Blackberry device calendars and
their impact upon Outlook also seem to be
affected to a different degree, and RIM informed me they are working on a
patch, expected in late January. I wonder how/if Windows Mobile is affected,
and what impact the 928388 patch may have upon those client's Outlook
clients' and calendar syncing.
For now, I'm advising all my clients to type the time of an appointment
into the appointment subject line, and am eagerly waiting for corrective
action from Microsoft.