When multiple AppStacks that share common components are assigned to a machine, you can reorder the AppStacks to give priority to oneAppStack over the others.

You can re-order AppStacks provisioned with App Volumes 2.5 or later.

As an example, you can have both Adobe 9 and Adobe 10.x App Volumes attached to a machine, although they cannot co-exist natively. When users double-click a PDF file on the desktop, only one Adobe Reader is launched. If you have assigned a higher precedence to Adobe 9 than Adobe 10.x, Adobe 9 gets the priority as the default PDF reader application. If you want to modify the default application, you can use the reordering feature in App Volumes Manager to adjust the stack order, so that Adobe 10.x becomes the default PDF reader.

See the KB article https://kb.vmware.com/kb/2146035 for information on how to provision and use Microsoft Office applications with App Volumes.