In the context of the input sentence, determine the relationship between 'Zimbra' and 'Software'.
Options: distributed by, product/material produced, brand, operator

Companies discussed in the Global Enterprise Social Software Market research report are IBM Corporation Microsoft Corporation Jive Software Salesforce.com Zimbra Mzinga SAP SE OpenText Corporation Socialtext eXo Platform EMC Corporation Oracle Corporation Google Interact Intranet Alfresco Infor Elcom Technology Autodesk Inc. Sitrion.
product/material produced