The MSIExec utility can do more than simply install or remove applications. You can also use it
to perform an update of the application. The following command line switches tell about the
update options.
/update Update1.MSP[;Update2.MSP] Performs an update based on the content of one or
more Microsoft Patch (MSP) files. Separate the individual MSP entries with a semicolon (;).
NOTE Some versions of MSIExec support a /p command line switch file updates where you supply
the update package as the input argument. This form doesn??™t support multiple update packages
and it doesn??™t provide a means of removing the patch. Use the /update command line
switch if your version of MSIExec supports it. (The utility displays an error message when you
attempt to use the /update command line switch with a version that doesn??™t support it.) The
best way to determine the MSIExec version number isn??™t to use the MSIExec /? command.
Check the MSI.DLL version number instead. When Microsoft performs an update, it usually
updates MSI.DLL instead of MSIExec.EXE.
/uninstall PatchCodeGuid[;Update2.MSP] /package {Product.MSI | ProductCode}
Removes an update based on the patch??™s GUID.
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