Exchange 2010 - Room Finder Duplicate

I have created a room list in exchange 2010 and every seems to working fine. When I drop down the room finder menu on the scheduling assistant on Outlook 2010, I get the list twice.
I have ensured that the list only has one existence in AD, and I have also rebuilt the address book but it still seems to be showing the list twice.
I found an article explaining that deleting the below registry key solves the issue which it does until you schedule another meeting using the room finder and then the duplicate room list appears:
HKEY_CURRENT_USER/Software/Microsoft/Office/14.0/Outlook/preferences/RoomFinderRecentRoomList
Please can somebody assist
Kind Regards
Chris Branagan
Microsoft Certified Solutions Associate - Server 2012

Hi,
I did a test in my environment, and the Room Finder can work fine with Exchange 2010 and Outlook 2010.
Does the issue happen to all users? Please start Outlook in Online mode and check whether the issue persists. If the issue doesn't happen in Online mode, please create a new Outlook profile to have a try.
If it doesn't work, please start Outlook in safe mode to narrow down whether the issue is caused by any third-party add-ins in Outlook client.
Regards,
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Winnie Liang
TechNet Community Support

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Hi,
Just add more in this issue, following testing is done.
referring results and conclusion, you will get better view on issue
====================
Test Case - 1
User OnCloud/O365 - Pratik Nimbalkar
Email ID - [email protected]
( same as UPN)
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Results - Accepted
Room Booking Scenario for same slot- ReBook Room for 6.30pm to 7.30pm slot
Results - Declined
Conclusion = working fine
==================
Test Case - 2
User OnCloud/O365 - Testsm
Email ID - [email protected]
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=========================
Conclusion = There is issue with booking room and not getting response while user is
@abc.my id.
======================
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RunspaceId   : ea4ebc26-1d22-4a7d-b115-1b609099bae3
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Hi,
We are having issues with room finder not populating the room resources that are available inside a meeting request within outlook 2010. It also appears that there is a drop down box that is present in a lot of the other forums and pages that I have referenced
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Hi,
According to your description, I understand that room finder cannot show available room in Outlook 2010.
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Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
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Room Finder - Choose an available room - Empty -outlook 2010

Hi,
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Helpdesk Supporter

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AcceptMessagesOnlyFromDLMembers : {}
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ArbitrationMailbox : XXX.XXX.XXX/Users/SystemMailbox{1f05a927-16bf-44ae-aea1-b9d6c4937af1}
BypassModerationFromSendersOrMembers : {}
OrganizationalUnit : XXX.XXX.XXX/Users
CustomAttribute1 :
CustomAttribute10 :
CustomAttribute11 :
CustomAttribute12 :
CustomAttribute13 :
CustomAttribute14 :
CustomAttribute15 :
CustomAttribute2 :
CustomAttribute3 :
CustomAttribute4 :
CustomAttribute5 :
CustomAttribute6 :
CustomAttribute7 :
CustomAttribute8 :
CustomAttribute9 :
ExtensionCustomAttribute1 : {}
ExtensionCustomAttribute2 : {}
ExtensionCustomAttribute3 : {}
ExtensionCustomAttribute4 : {}
ExtensionCustomAttribute5 : {}
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GrantSendOnBehalfTo : {}
ExternalDirectoryObjectId :
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LastExchangeChangedTime :
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Need detail information, steps would be nicer, to upgrade from Exchange 2003 to Exchange 2010 to setup in test system first then try on production, since not much room for downtime, thanks bekir

Need detail information, steps would be nicer, to upgrade from Exchange 2003 to Exchange 2010 to setup in test system first then try on production, since not much room for downtime, thanks bekir

Hi,
Overview of the upgrade progress from Exchange 2003 to Exchange 2010 including the following steps:
Installing Exchange 2010 within your organization on new hardware.
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Creating a set of legacy host names and associating those host names with your Exchange 2003 infrastructure.
Obtaining a digital certificate with the names you'll be using during the coexistence period and installing it on your Exchange 2010 Client Access server.
Associating the host name you currently use for your Exchange 2003 infrastructure with your newly installed Exchange 2010 infrastructure.
Moving mailboxes from Exchange 2003 to Exchange 2010.
Decommissioning your Exchange 2003 infrastructure.
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http://technet.microsoft.com/en-us/library/ff805040(v=exchg.141).aspx
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http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/resource-mailboxes-exchange-2010-part1.html
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Exchange 2010 - Room Finder Duplicate

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