Some members of a custom address list don't appear in Outlook 2007 when Adding Attendees

I have Exchange 2007 Enterprise on Windows 2003 Standard. This was upgraded from Exchange 2003 Enterprise about 8 months ago.

The problem is that I don't see one room (Conference Area Engineering) and one equipment (Camera1) in the Resources address list when trying to reserve them in Outlook 2007. Specifically, a user will create a new meeting, Add Attendees, select the Resources address book, and these two resources are not listed.

However, the Conference Area Engineering appears in the All Rooms address list.

The Conference Area Engineering can successfully be booked, and when I first set up the Camera1, it could be reserved also. I think they stopped appearing a while ago. Not sure when. They are set up to send an email confirmation (or denial) when reserved.

Conference Area Engineering is a Room Mailbox and Camera1 is an Equipment Mailbox. They, along with my other rooms and equipment, are located in AD under my domain, Users, Resources.

I'm not sure if it's related, but when I go into Exchange Management Console, Organization Configuration, Mailbox, Address Lists tab and attempt to edit the Resources address list, I get the error "The specified address list could not be edited. Address lists created by using legacy versions of Microsoft Exchange must be upgraded by using the 'ForceUpgrade' parameter of the 'Set-AddressList' cmdlet."

I did successfully upgrade the default address lists (All Contacts, All Groups, All Users, Public Folders) using http://msexchangeteam.com/archive/2007/01/11/432158.aspx , but couldn't figure out the syntax for upgrading this custom address list created in Exchange 2003.

I'd appreciate any help. Thanks.
JohnValueAsked:
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SubsunCommented:
You must upgrade these LDAP filters to the OPATH syntax
 
Refer the MS KB for upgrading Custom LDAP Filters to OPATH Filters.
http://technet.microsoft.com/en-us/library/cc164375.aspx
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JohnValueAuthor Commented:
I finally called Microsoft tech support, who fixed it. Here is what we did:

RESOLUTION
============

= We were able to VIEW all the resource mailboxes on the ALL Rooms address list but not in the resources address list which was created
= When we Edit the Resources Address  List we get a message "Specified address list could not be edited. Address lists created by using legacy version of MS Exchange must be upgraded by using the force upgrade parameter of the set- address list command CMDLET"

= All the resources are in the same active directory
= We First ran update-addresslist "resources". We are now able to see the update Resources in the address list
= We Followed the article http://msexchangeteam.com/archive/2007/01/11/432158.aspx
= As per the message above we ran Set-Addresslist "resource" -forceupgrade . Nothing changed
= Also Ran set-Addresslist "resources " but the included recipients was unknown
= Hence checked the Purported search value in ADSIEDIT. The recipient filter was grayed out but the same was in adsiedit. Copied it to a notepad.
= Ran set-addresslist "resources" -Recipientfilter and pasted the value in the Shell
= We get an error
= Hence we decided to create a new Address list called "resources". Created a new address list and only filtered the Resource Mailbox.
= We were able to preview the required Resources in the list
= Removed the old "resources" address list.
= Issue resolved
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