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Follow these steps:

• Apply ALL hotfixes to the DPM 2007 SP1 first.
  
  

  Update Type	Version	Release Date	Details
  DPM 2010 – Beta	3.0.7336.0	09/25/2009	https://connect.microsoft.com/Downloads/DownloadDetails.aspx?SiteID=840&DownloadID=22070
  DPM 2007 – Hotfix	02.00.8861.0000	11/05/2009	http://support.microsoft.com/kb/976542/
  DPM 2007 – Hotfix	02.00.8851.0000	08/28/2009	http://support.microsoft.com/kb/970868/
  DPM 2007 – Hotfix	02.00.8844.0000	06/04/2009	http://support.microsoft.com/kb/970867/
  DPM 2007 – Hotfix	2.0.8836.0	04/14/2009	http://support.microsoft.com/kb/968579
  DPM 2007 – Hotfix	2.00.8824.0	02/16/2009	http://support.microsoft.com/kb/963102/
  DPM 2007 – Hotfix	2.0.8811.0	01/09/2009	http://support.microsoft.com/kb/961502/
  DPM 2007 – SP1	2.0.8793.0	12/19/2008	http://support.microsoft.com/kb/959605/
  DPM 2007 – Hotfix	2.0.8111.0	07/31/2008	http://support.microsoft.com/kb/954641/
  DPM 2007 – Feature Pack	2.0.8107.0	07/18/2008	http://support.microsoft.com/kb/949779/
  DPM 2007 – Hotfix			http://support.microsoft.com/kb/948936/
  DPM 2007 – Hotfix	2.0.5820.0	04/24/2008	http://support.microsoft.com/kb/951557/
  DPM 2007 – Hotfix			http://support.microsoft.com/kb/950082/
  DPM 2007 – Hotfix			http://support.microsoft.com/kb/948373/
  DPM 2007 – Hotfix		01/09/2008	http://support.microsoft.com/kb/946647/
  DPM 2007 – RTM		10/17/2008

• Backup the DPM database.

  1. From the command prompt, run DPMBackup.exe –db
  2. Browse to Program FilesMicrosoft Data Protection ManagerDPMVolumesShadowCopyDatabase Backups. The file name of the DPM database backup is DPMDB.bak. Copy it to the media to which you want.

• Uninstall DPM and choose to retain data.  ( important!!! )
  1. Click Add or Remove Programs on the Control Panel, and then click Change or Remove Programs.
  2. Under Currently installed programs, select Microsoft System Center Data Protection Manager 2007 and then click Change/Remove.
  3. On the Uninstallation Options page, select the Retain data option, and then click Next.
  4. On the Summary of Options page, click Uninstall.
  5. When uninstallation is complete, click Close
  
• Uninstall Powershell.
  1. In Control Panel, click Add or Remove Programs, and then click Change or Remove Programs.
  2. Under Currently installed programs, select Windows Powershell and then click Change/Remove
  
• Upgrade the server to Windows Server 2008/Windows 2008 R2 ( remember DPM 2010 only installs on x64 ).
  1. Make sure that the bit version of both operating systems are same. If not, then you need to do a clean installation for the x64 bits
  
• Delete the DPM database.
  1. Open the Microsoft SQL Server Management Studio
  2.  Select the MS$DPM2007$ database, and then click Connect.
  3. Expand Databases, right-click the DPMDB database, and then click Delete.
  4. Click Yes to confirm the deletion
  
• Install DPM 2010.
  
• Restore the DPM database.
  1. Browse to the backup Path.
  2. From the command prompt, type DpmSync –restored –dbloc < DPMDB location> and then press ENTER

      3. From the command prompt, type DpmSync -sync