Update Rollup 3 for Exchange Server 2007 SP3 resolves the issues that are described in the following Microsoft Knowledge Base articles:

2498066 “Insufficient system resources exist to complete the requested service" error message when you try to extend database files in an Exchange Server 2007 environment

2497679 A meeting request may not open correctly after you disable the "Display sender’s name on messages" option in the EMC of Exchange Server 2007 SP2 or SP3

2493529 Event ID 1160 is logged and the Microsoft Exchange Information Store service randomly stops responding on an Exchange Server 2007 server

2492384 A meeting response status from an external attendee may be incorrect if you send the meeting request from an Exchange Server 2007 environment

2490788 A calendar synchronization times out when you use ActiveSync to synchronize with an Exchange Server 2007 mailbox on a mobile device

2489898 An item is removed unexpectedly from a public folder in an Exchange Server 2007 environment

2480197 The "Require SSL" setting is unexpectedly unselected on the RPC virtual directory on an Exchange Server 2007 server

2479939 The "ScheduleOnlyDuringWorkHours" property of a resource mailbox may not function as expected in an Exchange Server 2007 environment

2477139 DTMF inputs are not accepted by a UM auto attendant while the greeting message is playing in an Exchange Server 2007 environment

2470759 The "Test-Replicationhealth" cmdlet fails on a stretched cluster in an Exchange Server 2007 SP3 CCR environment

2461537 The Microsoft.Exchange.Search.ExSearch.exe process consumes 100% CPU after you apply Update Rollup 1 or Update Rollup 2 for Exchange Server 2007 SP3 on the passive node of a SCC

2457838 "554 5.6.0" NDR message when you send an email message to an Exchange Server 2007 mailbox from a Macintosh computer

2450078 The sent time in an email message body is incorrect when you reply or forward the email message by using an EWS application in an Exchange Server 2007 environment

2448291 "Object has been corrupted and it is in an inconsistent state" warning message when you view a transport rule on an Exchange Server 2007 SP3 server

2445129 (http://support.microsoft.com/kb/2445129/ ) The W3WP.exe process may crash when a WebDAV client connects to an Exchange Server 2007 server

2418993 The Edgetransport.exe process crashes when you close a Telnet session before you receive an SMTP banner in an Exchange Server 2007 environment

2410330 The EdgeTransport.exe process crashes if the pipeline tracing feature is enabled together with a redirect transport rule in an Exchange Server 2007 environment

2408435 "Computer account for ‘SMTPSVC/’ not found in Active Directory." error message in an Exchange Server 2007 environment

2394853 The returned URL is incorrect when you use the WebDAV "X-MS-ENUMATTS" method to enumerate an attachment in an Exchange Server 2007 environment

2294143 Duplicate read receipts are sent when using a POP3 client or an IMAP4 client in an Exchange Server 2007 environment

2267661 Some body parts of a message are displayed as attachments when an Exchange Server 2007 user sends the message by using a third-party mail client

2032592 VSS backup fails on a passive node of an Exchange Server 2007 CCR cluster and Event ID 2034 is logged

982714 The values of total items that are returned by running the "Export-ActiveSyncLog" cmdlet on an Exchange Server 2007 server are incorrect

979338 Fax communication sessions are dropped by an Exchange Server 2007 Unified Messaging server

955480 A meeting request is stamped as Busy instead of Tentative when it is sent from an external user to an Exchange Server 2007 user

Download the Update HERE

I used the following steps to do this.

1. All public folders and system folders that are housed on the Exchange 2007 CCR Cluster computer must be replicated to another Exchange 2007/2010 computer that is in the site.

2. Verify the contents of the public folder store with the following Powershell commands
Get-PublicFolderStatistics -server <Exchange 2007_Server_Name> | fl | out-file d:\PFstat.txt

Get-PublicFolder -server < Exchange 2007_Server_Name > \ -recurse | fl | out-file d:\PFIPMSub.txt

Get-PublicFolder -server < Exchange 2007_Server_Name > \non_ipm_subtree -recurse | fl | out-file d:\PFNonIPMSub.txt.

3. Remove the replicas from the public folder store

MoveAllReplicas.ps1 -Server ccrclustername –NewServer newservername

4. Remove the public folder store

Remove–PublicFolderDatabase –Identity "Public_Folder_Store_Name"

5. Change the server that is responsible for generating the Offline Address Lists

Move-OfflineAddressBook –Identity OfflineAddressBookIdParameter -Server ServerIdParameter

6. Move the Routing Group Connectors by using the following command:

Get-RoutingGroupConnector | where {$_.SourceTransportServers -like "<First Exchange 2007 server>"} | Set-RoutingGroupConnector -SourceTransportServers "<Second Exchange 2007 server>"
Get-RoutingGroupConnector | where {$_.TargetTransportServers -like "<First Exchange 2007 server>"} | Set-RoutingGroupConnector -TargetTransportServers <Second Exchange 2007 server>

7. To modify any Send connectors that have the first Exchange 2007 server as the source transport server, run the following commands:

Get-SendConnector | where {$_.SourceTransportServers -like "<First Exchange 2007 server>"} | Set-SendConnector -SourceTransportServers "<Second Exchange 2007 server>"

8.Important:
How to use the Exchange Server SP1 2007 Setup wizard to remove Exchange 2007

1. Log on to the server from which you want to remove Exchange 2007.

2. Open Control Panel, and then double-click Programs and Features.

3. In Programs and Features, select Microsoft Exchange Server 2007, and then click Uninstall.

   If you click Change instead of Uninstall, you can add server roles, but you cannot remove server roles.

4. In the Exchange Server 2007 SP1 Setup wizard, on the Exchange Maintenance Mode page, click Next.

5. On the Server Role Selection page, clear all the server role check boxes, clear the Management Tools check box, and then click Next.

   By default, all server roles are selected. This indicates that no server roles will be removed. To remove a server role, you must clear the appropriate check box.

6. On the Readiness Checks page, after the check completes, click Uninstall.

7. On the Completion page, click Finish.

8. (Optional) If you are removing Exchange from a Mailbox server, remove the Exchange database files (*.edb) and storage group log files (*.log).

   If you reinstall the Mailbox server role on this server, you must first remove the database and log files from the server.

9. (Optional) Remove the setup log files that are located at %systemdrive%\ExchangeSetupLogs.

10. (Optional) Remove the following virtual servers that are created for Exchange 2007 under the Default Web Site in IIS:

    • Microsoft-Server-ActiveSync
    • OAB
    • Owa

    When you remove Exchange 2007, neither IIS nor these virtual servers are removed

9.  First Remove the Passive Mailbox Node

10. Second the Primary Mailbox Role

11. Remove the CAS/HUB’s Role on the nodes
Important: NOT AT THE SAME TIME

13. Demote the NLB Cluster

14. Remove the Servers from the domain

16. Take a cold bier when you are don with testing and everything works

The Error:
Failed to Mount Public Folder database after a lossy failover because the current setting for AutoDataseBaseMountDial. You Must run Restore-StorageGroupCopy before you can mount the Database
 

Solution:
Restore-StorageGroupCopy won’t work because it is public folder database.

Setting a Vink by Do not Mount this Database at Startup.

En give the active clustered mailbox server a  reboot. Then Cluster service will show that the other node is going online. Then the public folder is back online. After every reboot you must start to check if the public folder online is?