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SharePoint 2010: Upgrade from MOSS 2007 to SharePoint 2010 - TechNet Articles - United States (English) - TechNet Wiki

Upgrade from MOSS 2007 to SharePoint 2010 has been very common these days. The migration can be dominated by many factors, few of them are listed below.
 

SharePoint 2010: Upgrade from MOSS 2007 to SharePoint 2010

here.

The steps for the upgrade can be summarized as follows.

  1. Take the content database backup from MOSS environment 
  2. Deploy any customizations which are rebuilt on SharePoint 2010. 
  3. Restore the ContentDB in SharePoint 2010 farm.
  4. Attach the New ContentDB in SP2010 using 'Mount-SPContentDatabase' command. 
  5. Run the Utility(Feature admin) and Clean the feature which is\are giving error for this content database.
  6. Delete the unwanted sitecollections (Deleteit using Remove-SPSite, deleting from UI keeps a reference in content database)
  7. Upgrade the contentDB  using 'Upgrade-SPContentDataBase'
  8. Deploy the new customization if any.

After upgrade please review the Database status in 'Upgrade & Migration' in Central Admin. It should show 'No action required'. The upgrade status should also read 'Successed' with 100%.

If there are errors during upgrade the status will be failed. Review the Upgrade log in this case to get the exact cause for failure. After removing the faulty component we can hit the upgrade command (pt. 7 above) again to upgrade the content database.