There were no system changes as far as I know.
There might be a connection between the problem and the implementation of a new Citrix server (running on a new Windows Server 2003)
But
1.    that server is used by a dozen other users and they have no complaints
2.    the problem occurs also when the Citrix server is bypassed (Outlook installed on the client PC).

When I log on with my own account I can access my OAB / Contacts without errors; when I log on using the other user's account I get the error situation. (by the way: it looks if there is a problem with the combobox holding the list of contacts in the OAB view; trying to show hidden entries by scrolling through the data seems to trigger the error condition)

Leo Ley

   
    ----- Russ Valentine [MVP-Outlook] wrote: ----
   
    I meant the changes you made to your system before the problem arose
    I assume the address book worked at some point
    --
    Russ Valentin
    [MVP-Outlook
    "Leo Leys" <anonymous@discussions.microsoft.com> wrote in messag
    news:94944B0C-B484-4FA5-81BF-14E34D1FE9BF@microsoft.com..
    > -The Outlook version is SP-(9.0.0.6627
    > Steps to reproduce are: start Outlook, open Address book, choose Outloo
    Address Book / Contacts
    > It is possible to select the visible entries one by one without errors
    but when one tries to see more entries (by selecting the last visible on
    and then hitting the arrow down key or moving the vertical scrollba
    downwards, the computer locks up
    >> This behavior is limited to one specific mailbox. It occurs on severa
    machines and on these same machines other address books are displaye
    normally
    >> Leo Ley
    >>>      ----- Russ Valentine [MVP-Outlook] wrote: ----
    >>      List all the possible steps to repro, including any updates applied
    I'l
    >      try to forward the information. I've seen a lot of similar report
    bu
    >      Microsoft can't reproduce this behavior
    >      --
    >      Russ Valentin
    >      [MVP-Outlook
    >      "Leo Leys" <anonymous@discussions.microsoft.com> wrote in messag
    >      news:CF00FDCE-EDA9-40F6-9C0F-8DAF333F79D4@microsoft.com..
    >> We have in our organization an Exchange Server 5.5 and Outlook 200
    >      clients
    >>> If one of the mailboxes is opened in Outlook 2000 an illega
    operatio
    >      occures after opening the Outlook Address Book and moving th
    scrollbar
    >      (Outlook Address Book\Contacts). The GAL is working fine
    >>> The error occurs on any client machine
    >>> Removing the oab service from the user's profile and reinstallin
    it
    >      doesn't solve the problem
    >>> In "contacts" view the list of contacts is accessible normally
    >>> The illegal operation occurs in emsmdb.dl
    >>> How can I troubleshoot this problem
    >>> Leo Ley

This is a copy of the error message ment in a previous posting:

OUTLOOK caused a stack fault in module EMSMDB32.DLL at 0167:62731ab6.
Registers:
EAX=0448f5fc CS=0167 EIP=62731ab6 EFLGS=00010216
EBX=00000000 SS=016f ESP=00531fcc EBP=0448f8e4
ECX=0448f5fc DS=016f ESI=0448f8e4 FS=0ca7
EDX=000005d7 ES=016f EDI=0448fb84 GS=0000
Bytes at CS:EIP:
56 8b f1 57 8b 86 c0 00 00 00 a8 20 75 0c 8b 8e
Stack dump:
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 0448fb84 0448f8e4