Hi,
I have been receiving many of these failure messages recently. Sometimes messages appear multiple times in my inbox following the error.

I am using zdesktop to access Yahoo small business mail.

Any help would be appreciated.
Ben
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Product name: Zimbra Desktop
Product version: 1.0.4
Build ID: 1833
Release type: R
OS Platform: Windows Vista x86 6.0
Time of event: 2011-05-04 15:48:14
Error type: service.FAILURE
Item ID: -1
Error summary: Fetch failed for uid 21940

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Affected data - PLEASE REMOVE ANY SENSITIVE INFORMATION (size=0):
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Failure details - PLEASE REMOVE ANY SENSITIVE INFORMATION
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com.zimbra.common.service.ServiceException: system failure: Unable to store IMAP message data
ExceptionId:mid=2:1304488094494:f17f5de877e625e4
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:253)
at com.zimbra.cs.db.DbImapMessage.storeImapMessage(Db ImapMessage.java:69)
at com.zimbra.cs.datasource.ImapFolderSync.storeImapM essage(ImapFolderSync.java:710)
at com.zimbra.cs.datasource.ImapFolderSync.handleFetc h(ImapFolderSync.java:1000)
at com.zimbra.cs.datasource.ImapFolderSync.access$500 (ImapFolderSync.java:64)
at com.zimbra.cs.datasource.ImapFolderSync$2.handleFe tchResponse(ImapFolderSync.java:915)
at com.zimbra.cs.mailclient.imap.FetchResponseHandler .handleResponse(FetchResponseHandler.java:34)
at com.zimbra.cs.mailclient.imap.ImapConnection.proce ssUntagged(ImapConnection.java:674)
at com.zimbra.cs.mailclient.imap.ImapConnection.proce ssResponse(ImapConnection.java:646)
at com.zimbra.cs.mailclient.imap.ImapConnection.nextR esponse(ImapConnection.java:623)
at com.zimbra.cs.mailclient.imap.ImapConnection.waitF orResponse(ImapConnection.java:541)
at com.zimbra.cs.mailclient.imap.ImapConnection.sendR equest(ImapConnection.java:475)
at com.zimbra.cs.mailclient.imap.ImapRequest.send(Ima pRequest.java:77)
at com.zimbra.cs.mailclient.imap.ImapRequest.sendChec kStatus(ImapRequest.java:81)
at com.zimbra.cs.mailclient.imap.ImapConnection.uidFe tch(ImapConnection.java:297)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:927)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:862)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:851)
at com.zimbra.cs.datasource.ImapFolderSync.syncMessag es(ImapFolderSync.java:243)
at com.zimbra.cs.datasource.ImapSync.syncMessages(Ima pSync.java:257)
at com.zimbra.cs.datasource.ImapSync.syncFolders(Imap Sync.java:195)
at com.zimbra.cs.datasource.ImapSync.importData(ImapS ync.java:152)
at com.zimbra.cs.offline.OfflineImport.importData(Off lineImport.java:88)
at com.zimbra.cs.offline.YMailImport.importData(YMail Import.java:53)
at com.zimbra.cs.datasource.DataSourceManager.importD ata(DataSourceManager.java:157)
at com.zimbra.cs.mailbox.LocalMailbox.importData(Loca lMailbox.java:417)
at com.zimbra.cs.mailbox.LocalMailbox.syncAllLocalDat aSources(LocalMailbox.java:389)
at com.zimbra.cs.mailbox.LocalMailbox.sync(LocalMailb ox.java:431)
at com.zimbra.cs.mailbox.LocalMailbox.syncOnTimer(Loc alMailbox.java:361)
at com.zimbra.cs.mailbox.DesktopMailbox$1.run(Desktop Mailbox.java:437)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: java.sql.SQLException: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'I_UID_IMAP_ID' defined on 'IMAP_MESSAGE'.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLExcep tion(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl .wrapInSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl .handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleE xception(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleE xception(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.executeS tatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement. executeStatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement. executeUpdate(Unknown Source)
at org.apache.commons.dbcp.DelegatingPreparedStatemen t.executeUpdate(DelegatingPreparedStatement.java:2 33)
at com.zimbra.cs.db.DbImapMessage.storeImapMessage(Db ImapMessage.java:66)
... 30 more
Caused by: ERROR 23505: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'I_UID_IMAP_ID' defined on 'IMAP_MESSAGE'.
at org.apache.derby.iapi.error.StandardException.newE xception(Unknown Source)
at org.apache.derby.impl.sql.execute.IndexChanger.ins ertAndCheckDups(Unknown Source)
at org.apache.derby.impl.sql.execute.IndexChanger.doI nsert(Unknown Source)
at org.apache.derby.impl.sql.execute.IndexChanger.ins ert(Unknown Source)
at org.apache.derby.impl.sql.execute.IndexSetChanger. insert(Unknown Source)
at org.apache.derby.impl.sql.execute.RowChangerImpl.i nsertRow(Unknown Source)
at org.apache.derby.impl.sql.execute.InsertResultSet. normalInsertCore(Unknown Source)
at org.apache.derby.impl.sql.execute.InsertResultSet. open(Unknown Source)
at org.apache.derby.impl.sql.GenericPreparedStatement .execute(Unknown Source)
... 35 more

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