I have rather a strange problem that I would like some comments on if at all
We have a reasonably large Exchange 5.5 organisation which has started
migration towards Exchange 2003. So far, two servers in a site have been
converted to Exchange 2003 and SRS and ADC connectors seem to be running
correctly. We have full visibility of all users in the GAL on both sides and
email flows correctly between both sides.
We do have a problem with accessing other users calendars though. Users on
the 2003 side can access all calendars (default permissions on calendars are
set to Reviewer) but users on the 5.5 side can only access 5.5 calendars.
Any attempts from a 5.5 user to access a 2003 calendar results in a message
from Outlook saying it can not open the folder.
We have traced the problem through diagnostic logging and network tracing
and are convinced it is not a lookup issue, Outlook correctly identifies the
server that holds the calendar and attempts to connect but seems to get an
access denied message.
The only way we can access a 2003 calendar from the 5.5 side is to give full
mailbox access through ADU&C, login in as a Domain Admin on the NT4.0 side
(normal users do not work) and then configure Outlook to access the 2003
mailbox as the only mailbox being used. The entire mailbox then opens
Initially Calendars did work and then stopped. We corrected some ADC issues
to get replication running again but calendars still do not work.
Currently SP2 is not installed on the Exchange 2003 servers but will be
applied in the next maintenance window.