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Applies to: 
SQL Server - Windows only
SQL Server supports upgrade from SQL Server 2008 (10.0.x) and later versions. This article documents support and behavior for upgrading SQL Server Management Tools and management components such as SQL Server Agent, Database Mail, Maintenance Plans, XPStar, and XPWeb.
For local installations, you must run SQL Server Setup as an administrator. If you run SQL Server Setup from a remote share, you must use a ___domain account that has read and execute permissions on the remote share.
Known upgrade issues
Consider the following issues before you upgrade to SQL Server:
All TSX servers should be upgraded before the MSX server is upgraded. For more information about MSX/TSX in SQL Server, see Automated Administration Across an Enterprise.
All components in an instance of SQL Server must be upgraded at the same time. Version numbers of the Database Engine, Analysis Services, and Reporting Services components must be the same in an instance of SQL Server.
You can add components to an existing installation of SQL Server at the time that you upgrade to SQL Server. For more information, see Upgrade SQL Server Using the Installation Wizard (Setup).
SQL Server Client Tools, such as SQL Server Management Studio, SQL Server Profiler, the Database Engine Tuning Advisor, sqlcmd, and osql aren't upgraded to SQL Server. Instead, Client Tools run side-by-side with tools from previous SQL Server versions. SQL Server supports importing settings from earlier versions of SQL Server Client Tools.
Authentication from SQL Server Agent to SQL Server is updated from SQL Server Authentication to Windows Authentication during upgrade. SQL Server Authentication isn't supported in SQL Server.
Data for jobs and alerts are preserved during upgrade to SQL Server.
If SQLMail is being used in the instance to be upgraded, associated XPs are supported and enabled after the upgrade. Otherwise, they're off.
Database Mail is upgraded with the Database Engine component of SQL Server. By default, Database Mail is off after upgrade. Any schema updates should be reconciled with an update script after upgrade.