TFS4JIRA Synchronizer is a web application accompanying JIRA plugin.
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TFS4JIRA Synchronizer installation process is quite straightforward. Simply run the installer (tfs4jira-synchronizer-setup-x.y.z.msi) as an administrator and follow instructions. The installer will warn you if any of the required components is missing (see this page for a list of prerequisites). TFS4JIRA Synchronizer application will be created under first IIS site bound to HTTP (80) port or under Default Web Site. If neither of them exists installation process will fail.
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