下文是幾個主要功能在兼容性上的問題列表：

1.SQL Server Database Engine Backward Compatibility

[反對] - Deprecated Database Engine Features in SQL Server 2008

[放棄] - Discontinued Database Engine Functionality in SQL Server 2008

[破壞變化] - Breaking Changes to Database Engine Features in SQL Server 2008

[行為變化] - Behavior Changes to Database Engine Features in SQL Server 2008

2.SQL Server Analysis Services Backward Compatibility

[放棄] - Discontinued Analysis Services Functionality in SQL Server 2008

[反對] - Deprecated Analysis Services Functionality in SQL Server 2008

[行為變化] - Behavior Changes to Analysis Services Features in SQL Server 2008

[破壞變化] - Breaking Changes to Analysis Services Features in SQL Server 2008

3.Integration Services Backward Compatibility

[反對] - Deprecated Integration Services Features in SQL Server 2008

[放棄] - Discontinued Integration Services Functionality in SQL Server 2008

[破壞變化] - Breaking Changes to Integration Services Features in SQL Server 2008

[行為] - Behavior Changes to Integration Services Features in SQL Server 2008

[支持數據轉換服務] - Support for Data Transformation Services (DTS) in SQL Server 2008

4.Reporting Services Backward Compatibility

[反對] - Deprecated Features in SQL Server Reporting Services

[放棄] - Discontinued Functionality in SQL Server Reporting Services

[破壞變化] - Breaking Changes in SQL Server Reporting Services

[行為變化] - Behavior Changes in SQL Server Reporting Services

5.Replication Backward Compatibility

[反對] - Deprecated Features in SQL Server Replication

[放棄] - Discontinued Functionality in SQL Server Replication

[行為變化] - Behavior Changes in SQL Server Replication

[破壞變化] - Breaking Changes in SQL Server Replication

[支持Replication數據到不同版本的SQL Server數據庫] - Using Multiple Versions of SQL Server in a Replication Topology

6.Full-Text Search Backward Compatibility

[反對] - Deprecated Full-Text Search Features in SQL Server 2008

[放棄] - Discontinued Full-Text Search Features in SQL Server 2008

[破壞變化] - Breaking Changes to Full-Text Search in SQL Server 2008

[行為變化] - Behavior Changes to Full-Text Search in SQL Server 2008

升級前使用Upgrade Advisor to Prepare工具可以分析當前SQL Server的安裝情況，可以生成一個提示升級前后需要修補的問題的報表。