I'm running Windows XP Home SP3 with Zimbra Desktop 0.91 Build 1338

I have no problems with connecting to my Yahoo! or Rocketmail accounts, but my ISP mail account connection keeps failing.

The zdesktop.log file ends with:

2008-10-13 23:43:27,548 INFO [sync-timer-e_gottwald@yahoo.com] [] datasource - Import completed for data source 'Yahoo'
2008-10-13 23:44:33,720 INFO [btpool0-7] [name=zimbra;ip=127.0.0.1;ds=gottwaldus;] datasource - Testing DataSource: { id=d757c44a-3d5a-4477-801e-67b759cf30da, type=pop3, isEnabled=true, name=gottwaldus, host=mail.gottwaldus.net, port=110, connectionType=cleartext, username=emil@gottwaldus.net, folderId=2 }
2008-10-13 23:44:34,063 INFO [btpool0-7] [name=zimbra;ip=127.0.0.1;ds=gottwaldus;] datasource - Test succeeded
2008-10-13 23:47:24,907 INFO [sync-timer-emil@gottwaldus.net] [] datasource - Importing data for data source 'gottwaldus'
2008-10-13 23:47:27,688 INFO [sync-timer-emil@gottwaldus.net] [] datasource - Found 3 new message(s) on remote server
2008-10-13 23:47:27,688 DEBUG [sync-timer-emil@gottwaldus.net] [] datasource - Fetching message with uid sm_153193A0_be0c48a87a5a41e78f9d2daca7db3fbf
2008-10-13 23:47:29,845 ERROR [sync-timer-emil@gottwaldus.net] [] Sieve - Evaluation failed. Reason: null
2008-10-13 23:47:29,845 WARN [sync-timer-emil@gottwaldus.net] [] datasource - Error applying filter rules
com.zimbra.common.service.ServiceException: system failure: writing new object of type 5
ExceptionId:sync-timer-emil@gottwaldus.net:1223956049845:4d0b035b156435c5
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:253)
at com.zimbra.cs.db.DbMailItem.create(DbMailItem.java :167)
at com.zimbra.cs.mailbox.Message.createInternal(Messa ge.java:399)
at com.zimbra.cs.mailbox.Message.create(Message.java: 323)
at com.zimbra.cs.mailbox.Mailbox.addMessageInternal(M ailbox.java:4820)
at com.zimbra.cs.mailbox.Mailbox.addMessage(Mailbox.j ava:4686)
at com.zimbra.cs.mailbox.Mailbox.addMessage(Mailbox.j ava:4642)
at com.zimbra.cs.filter.ZimbraMailAdapter.addMessage( ZimbraMailAdapter.java:414)
at com.zimbra.cs.filter.ZimbraMailAdapter.doDefaultFi ling(ZimbraMailAdapter.java:408)
at com.zimbra.cs.filter.ZimbraMailAdapter.executeActi ons(ZimbraMailAdapter.java:266)
at org.apache.jsieve.SieveFactory.evaluate(SieveFacto ry.java:159)
at com.zimbra.cs.filter.RuleManager.applyRules(RuleMa nager.java:196)
at com.zimbra.cs.datasource.MailItemImport.addMessage (MailItemImport.java:77)
at com.zimbra.cs.datasource.Pop3Sync.addMessage(Pop3S ync.java:210)
at com.zimbra.cs.datasource.Pop3Sync.fetchAndAddMessa ge(Pop3Sync.java:191)
at com.zimbra.cs.datasource.Pop3Sync.fetchAndRetainMe ssages(Pop3Sync.java:181)
at com.zimbra.cs.datasource.Pop3Sync.importData(Pop3S ync.java:117)
at com.zimbra.cs.datasource.DataSourceManager.importD ata(DataSourceManager.java:158)
at com.zimbra.cs.mailbox.LocalMailbox.importData(Loca lMailbox.java:354)
at com.zimbra.cs.mailbox.LocalMailbox.syncAllLocalDat aSources(LocalMailbox.java:327)
at com.zimbra.cs.mailbox.LocalMailbox.sync(LocalMailb ox.java:383)
at com.zimbra.cs.mailbox.LocalMailbox.syncOnTimer(Loc alMailbox.java:307)
at com.zimbra.cs.mailbox.DesktopMailbox$1.run(Desktop Mailbox.java:259)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: java.sql.SQLException: Log Record has been sent to the stream, but it cannot be applied to the store (Object null). This may cause recovery problems also.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLExcepti on(Unknown Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(U nknown 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.DbMailItem.create(DbMailItem.java :149)
... 23 more
Caused by: java.sql.SQLException: The store has been marked for shutdown by an earlier exception.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLExcepti on(Unknown Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(U nknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl .wrapInSQLException(Unknown Source)
... 32 more
Caused by: java.sql.SQLException: Unexpected exception on in-memory page Page(3,Container(0, 3249))
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLExcepti on(Unknown Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(U nknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl .wrapInSQLException(Unknown Source)
... 33 more
Caused by: java.sql.SQLException: Java exception: ': java.io.EOFException'.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLExcepti on(Unknown Source)
at org.apache.derby.impl.jdbc.Util.javaException(Unkn own Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl .wrapInSQLException(Unknown Source)
... 34 more
Caused by: java.io.EOFException
at org.apache.derby.iapi.services.io.ArrayInputStream .setLimit(Unknown Source)
at org.apache.derby.impl.store.raw.data.StoredPage.re adRecordFromArray(Unknown Source)
at org.apache.derby.impl.store.raw.data.StoredPage.re storeRecordFromSlot(Unknown Source)
at org.apache.derby.impl.store.raw.data.BasePage.fetc hFromSlot(Unknown Source)
at org.apache.derby.impl.store.access.btree.index.B2I RowLocking3.lockScanCommittedDeletedRow(Unknown Source)
at org.apache.derby.impl.store.access.btree.BTreeCont roller.reclaim_deleted_rows(Unknown Source)
at org.apache.derby.impl.store.access.btree.BTreeCont roller.start_xact_and_dosplit(Unknown Source)
at org.apache.derby.impl.store.access.btree.BTreeCont roller.doIns(Unknown Source)
at org.apache.derby.impl.store.access.btree.BTreeCont roller.insert(Unknown Source)
at org.apache.derby.impl.store.access.btree.index.B2I Controller.insert(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)
... 28 more
2008-10-13 23:47:30,892 INFO [sync-timer-emil@gottwaldus.net] [] datasource - Import completed for data source 'gottwaldus'
2008-10-13 23:47:30,892 ERROR [sync-timer-emil@gottwaldus.net] [] offline - sync failure: gottwaldus
com.zimbra.common.service.ServiceException: system failure: writing new object of type 5
ExceptionId:sync-timer-emil@gottwaldus.net:1223956050892:4d0b035b156435c5
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:253)
at com.zimbra.cs.db.DbMailItem.create(DbMailItem.java :167)
at com.zimbra.cs.mailbox.Message.createInternal(Messa ge.java:399)
at com.zimbra.cs.mailbox.Message.create(Message.java: 323)
at com.zimbra.cs.mailbox.Mailbox.addMessageInternal(M ailbox.java:4820)
at com.zimbra.cs.mailbox.Mailbox.addMessage(Mailbox.j ava:4686)
at com.zimbra.cs.mailbox.Mailbox.addMessage(Mailbox.j ava:4636)
at com.zimbra.cs.datasource.MailItemImport.addMessage (MailItemImport.java:99)
at com.zimbra.cs.datasource.Pop3Sync.addMessage(Pop3S ync.java:210)
at com.zimbra.cs.datasource.Pop3Sync.fetchAndAddMessa ge(Pop3Sync.java:191)
at com.zimbra.cs.datasource.Pop3Sync.fetchAndRetainMe ssages(Pop3Sync.java:181)
at com.zimbra.cs.datasource.Pop3Sync.importData(Pop3S ync.java:117)
at com.zimbra.cs.datasource.DataSourceManager.importD ata(DataSourceManager.java:158)
at com.zimbra.cs.mailbox.LocalMailbox.importData(Loca lMailbox.java:354)
at com.zimbra.cs.mailbox.LocalMailbox.syncAllLocalDat aSources(LocalMailbox.java:327)
at com.zimbra.cs.mailbox.LocalMailbox.sync(LocalMailb ox.java:383)
at com.zimbra.cs.mailbox.LocalMailbox.syncOnTimer(Loc alMailbox.java:307)
at com.zimbra.cs.mailbox.DesktopMailbox$1.run(Desktop Mailbox.java:259)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: java.sql.SQLException: Log Record has been sent to the stream, but it cannot be applied to the store (Object null). This may cause recovery problems also.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLExcepti on(Unknown Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(U nknown 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.DbMailItem.create(DbMailItem.java :149)
... 18 more
Caused by: java.sql.SQLException: The store has been marked for shutdown by an earlier exception.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLExcepti on(Unknown Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(U nknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl .wrapInSQLException(Unknown Source)
... 27 more
Caused by: java.sql.SQLException: Unexpected exception on in-memory page Page(3,Container(0, 3249))
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLExcepti on(Unknown Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(U nknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl .wrapInSQLException(Unknown Source)
... 28 more
Caused by: java.sql.SQLException: Java exception: ': java.io.EOFException'.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.get SQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.newEmbedSQLExcepti on(Unknown Source)
at org.apache.derby.impl.jdbc.Util.javaException(Unkn own Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl .wrapInSQLException(Unknown Source)
... 29 more
Caused by: java.io.EOFException
at org.apache.derby.iapi.services.io.ArrayInputStream .setLimit(Unknown Source)
at org.apache.derby.impl.store.raw.data.StoredPage.re adRecordFromArray(Unknown Source)
at org.apache.derby.impl.store.raw.data.StoredPage.re storeRecordFromSlot(Unknown Source)
at org.apache.derby.impl.store.raw.data.BasePage.fetc hFromSlot(Unknown Source)
at org.apache.derby.impl.store.access.btree.index.B2I RowLocking3.lockScanCommittedDeletedRow(Unknown Source)
at org.apache.derby.impl.store.access.btree.BTreeCont roller.reclaim_deleted_rows(Unknown Source)
at org.apache.derby.impl.store.access.btree.BTreeCont roller.start_xact_and_dosplit(Unknown Source)
at org.apache.derby.impl.store.access.btree.BTreeCont roller.doIns(Unknown Source)
at org.apache.derby.impl.store.access.btree.BTreeCont roller.insert(Unknown Source)
at org.apache.derby.impl.store.access.btree.index.B2I Controller.insert(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)
... 23 more

Any ideas?