Understanding Supported Upgrade Scenarios

The in-place upgrade process or the gradual migration process has limitations to which versions of SharePoint can be migrated, and which version of SharePoint 2010 they can be migrated to. Table 5.1 indicates which versions of various SharePoint products can be upgraded directly using the in-place upgrade process provided by Microsoft.

Table 5.1. Supported Direct In-Place Upgrade Targets for Various SharePoint Versions

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As indicated in Table 5.1, the older versions of SharePoint are not supported for direct upgrade and must be first upgraded to a supported version if using the Microsoft tools. If this is not an option, third-party tools are available from major SharePoint manufacturers that enable direct upgrade between versions.

Note

If the source SharePoint 2007 farm is running SQL Server Express, it can only be upgraded to the equivalent SharePoint 2010 edition running with SQL Server 2008 Express Edition. To get around this issue, use the database attach upgrade process instead.

One exception to this list in terms of the database attach upgrade process involves WSS 3.0 migrations directly to SharePoint Server editions, which are supported on a database-by-database basis. In other words, you can take multiple WSS 3.0 farms, pull the content databases from those farms, and migrate their contents directly into a new SharePoint 2010 Server environment that has been freshly built. For more information about this option, see the “Examining the Database Attach Scenario” section of this chapter.

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