1. Shared Components and Patch Uninstalls

2. 5/19/2015Microsoft Confidential2 Shared Components and Patch Uninstalls on Vista and below Word Outlook Installs Spell Checker v12.0 Installs Spell Checker v12.5 Updates Spell Checker to v12.6 Install WordInstall OutlookApply a patch to Word Uninstall the patch to Word Word Outlook Word Patch Word Outlook Updates Spell Checker to v12.0 Design Change: Windows Installer patch uninstall behavior should consider the global machine state instead of just the product state. Requirement: Ability to keep the highest version of a shared component when a patch to it is uninstalled

3. Shared Components and Patch Uninstalls with Windows Installer 4.5 Installs Spell Checker v12.0 Installs Spell Checker v12.5 Updates Spell Checker to v12.6 Install WordInstall OutlookApply a patch to Word Uninstall the patch to Word Updates Spell Checker to v12.5 Word Outlook Word Outlook Word Patch Word Outlook Spell Checker 12.0 Windows Installer Datastore Spell Checker 12.0 Word’s cache Spell Checker 12.5 Spell Checker 12.6 Spell Checker 12.5 Outlook’s cache Spell Checker 12.5