Hi,
I just installed and tested ZD2. MBP 2,53 late 2008; OS X 10.6.2 incl. all available updates
With GMAIL I get the following error. (Was also in ZD1!)

The credentials are correct.
Code:
Fehler bei der Kommunikation mit dem Server. Bitte versuchen Sie es später erneut.
Debugging-Nachricht: [SQLITE_CONSTRAINT] Abort due to constraint violation (column item_id is not unique)
Ausnahme:
com.zimbra.common.service.ServiceException: system failure: Synchronization of folder '[Gmail]/Spam' failed
ExceptionId:sync-mbox-v.n@gmail.com:1265632811680:6a2cf1a414680016
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:248)
at com.zimbra.cs.datasource.ImapSync.syncFailed(ImapSync.java:345)
at com.zimbra.cs.datasource.ImapSync.syncRemoteFolders(ImapSync.java:266)
at com.zimbra.cs.datasource.ImapSync.syncFolders(ImapSync.java:237)
at com.zimbra.cs.datasource.ImapSync.importData(ImapSync.java:154)
at com.zimbra.cs.offline.OfflineImport.importData(OfflineImport.java:102)
at com.zimbra.cs.offline.GMailImport.importData(GMailImport.java:53)
at com.zimbra.cs.datasource.DataSourceManager.importData(DataSourceManager.java:253)
at com.zimbra.cs.mailbox.DataSourceMailbox.importData(DataSourceMailbox.java:470)
at com.zimbra.cs.mailbox.DataSourceMailbox.syncAllLocalDataSources(DataSourceMailbox.java:434)
at com.zimbra.cs.mailbox.DataSourceMailbox.sync(DataSourceMailbox.java:486)
at com.zimbra.cs.mailbox.DataSourceMailbox.syncOnTimer(DataSourceMailbox.java:400)
at com.zimbra.cs.mailbox.SyncMailbox$1.run(SyncMailbox.java:254)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Caused by: com.zimbra.common.service.ServiceException: system failure: Unable to add mapping for dataSource gmail
ExceptionId:sync-mbox-v.n@gmail.com:1265632811679:6a2cf1a414680016
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:248)
at com.zimbra.cs.db.DbDataSource.addMapping(DbDataSource.java:109)
at com.zimbra.cs.datasource.DataSourceMapping.add(DataSourceMapping.java:91)
at com.zimbra.cs.datasource.ImapSync.createFolderTracker(ImapSync.java:83)
at com.zimbra.cs.datasource.ImapFolderSync.createLocalFolder(ImapFolderSync.java:513)
at com.zimbra.cs.datasource.ImapFolderSync.syncFolder(ImapFolderSync.java:116)
at com.zimbra.cs.datasource.ImapSync.syncRemoteFolders(ImapSync.java:261)
... 12 more
Caused by: java.sql.SQLException: [SQLITE_CONSTRAINT] Abort due to constraint violation (column item_id is not unique)
at org.sqlite.DB.newSQLException(DB.java:415)
at org.sqlite.DB.newSQLException(DB.java:420)
at org.sqlite.DB.execute(DB.java:367)
at org.sqlite.DB.executeUpdate(DB.java:391)
at org.sqlite.PrepStmt.executeUpdate(PrepStmt.java:88)
at com.zimbra.cs.db.DebugPreparedStatement.executeUpdate(DebugPreparedStatement.java:173)
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:102)
at com.zimbra.cs.db.DbDataSource.addMapping(DbDataSource.java:101)
... 17 more
Wenn das Problem weiterhin besteht, melden Sie eine Fehlerbeschreibung und Debugging-Informationen bitte hier.