IO errors in mailbox.log

[sci]

Hi all

I´ve been this error on mailbox.log

2009-12-14 15:51:04,933 INFO [ImapServer-25013] [ip=10.10.10.134;] ProtocolHandler - I/O error while processing connection: java.net.SocketException: Connection reset

The client at 10.10.10.134 is using Outlook Express (Don´t ask why...) and has a massive number of folders (aprox. 100) and filters (aprox. 160). Everything appears to be working well though, i just got a little worried about those errors showing up for that specific account only.

Does anyone has any clues?

UPDATE: Also found that on mailbox.log. The error is related to the account mentioned above but i i really don´t know if it´s related to error above:

2009-12-14 16:30:24,329 ERROR [ImapServer-25039] [name=xxxxxxxxx@xxxxxxxxx.com.br;mid=433;ip=10.10.1 0.134;] mailbox - ignoring error during cache commit
java.lang.NullPointerException
at com.zimbra.cs.index.LuceneIndex.deleteDocuments(Lu ceneIndex.java:258)
at com.zimbra.cs.index.MailboxIndex.deleteDocuments(M ailboxIndex.java:293)
at com.zimbra.cs.mailbox.IndexHelper.deleteDocuments( IndexHelper.java:209)
at com.zimbra.cs.mailbox.Mailbox.commitCache(Mailbox. java:6859)
at com.zimbra.cs.mailbox.Mailbox.endTransaction(Mailb ox.java:6739)
at com.zimbra.cs.mailbox.Mailbox.delete(Mailbox.java: 5361)
at com.zimbra.cs.imap.ImapHandler.expungeMessages(Ima pHandler.java:2690)
at com.zimbra.cs.imap.ImapHandler.doEXPUNGE(ImapHandl er.java:2645)
at com.zimbra.cs.imap.ImapHandler.executeRequest(Imap Handler.java:351)
at com.zimbra.cs.imap.TcpImapHandler.processCommand(T cpImapHandler.java:99)
at com.zimbra.cs.tcpserver.ProtocolHandler.processCon nection(ProtocolHandler.java:175)
at com.zimbra.cs.tcpserver.ProtocolHandler.run(Protoc olHandler.java:132)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Wo rker.run(Unknown Source)
at java.lang.Thread.run(Thread.java:619)

Thanks in advance.