It has not been updated since 6:30am local time, ie no entries surring the restarts.
Code:
tail mailbox.log
2009-03-17 06:30:56,976 INFO [Shutdown] [] extensions - Destroyed extension license: com.zimbra.cs.network.license.LicenseExtension@com.zimbra.cs.extension.ZimbraExtensionClassLoader@9abce9
2009-03-17 06:30:56,976 INFO [Shutdown] [] extensions - Destroyed extension zimbrasync: com.zimbra.zimbrasync.ZimbraSync@com.zimbra.cs.extension.ZimbraExtensionClassLoader@1b11b79
2009-03-17 06:30:56,976 INFO [Shutdown] [] extensions - Destroyed extension : com.zimbra.cs.network.NetworkInitializer@com.zimbra.cs.extension.ZimbraExtensionClassLoader@9c176c
2009-03-17 06:30:56,976 INFO [Shutdown] [] extensions - Destroyed extension zimbra_xmbxsearch: com.zimbra.xmbxsearch.ZimbraXMbxSearchExtension@com.zimbra.cs.extension.ZimbraExtensionClassLoader@c2cf83
2009-03-17 06:30:56,976 INFO [Shutdown] [] extensions - Destroyed extension com_zimbra_cert_manager: com.zimbra.cert.ZimbraCertMgrExt@com.zimbra.cs.extension.ZimbraExtensionClassLoader@159054d
2009-03-17 06:30:56,976 INFO [Shutdown] [] extensions - Destroyed extension hsm: com.zimbra.cs.hsm.HsmInitializer@com.zimbra.cs.extension.ZimbraExtensionClassLoader@79801c
2009-03-17 06:30:56,976 INFO [Shutdown] [] extensions - Destroyed extension clamscanner: com.zimbra.clam.ClamScanner@com.zimbra.cs.extension.ZimbraExtensionClassLoader@8c7be5
2009-03-17 06:30:56,976 INFO [Shutdown] [] extensions - Destroyed extension ZimbraIMInterop: com.zimbra.iminterop.ZimbraInteropExtension@com.zimbra.cs.extension.ZimbraExtensionClassLoader@309f9f
2009-03-17 06:30:56,976 INFO [Shutdown] [] soap - Servlet SoapServlet shutting down
2009-03-17 06:30:57,078 INFO [Shutdown] [] log - Shutdown hook complete