This account was syncing fine all day yesterday but is getting this error today. My other @att.net account is fine.

Debug message: Unexpected tag in response(expected C09 but got C08)

Exception:

com.zimbra.common.service.ServiceException: system failure: Synchronization of folder '/Inbox' failed
ExceptionId:sync-mbox-rick@att.net:1265986479001:577c3b4146da47a5
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:248)
at com.zimbra.cs.datasource.ImapSync.syncFailed(ImapS ync.java:345)
at com.zimbra.cs.datasource.ImapSync.syncMessages(Ima pSync.java:307)
at com.zimbra.cs.datasource.ImapSync.syncFolders(Imap Sync.java:239)
at com.zimbra.cs.datasource.ImapSync.importData(ImapS ync.java:154)
at com.zimbra.cs.offline.OfflineImport.importData(Off lineImport.java:102)
at com.zimbra.cs.offline.YMailImport.importData(YMail Import.java:53)
at com.zimbra.cs.datasource.DataSourceManager.importD ata(DataSourceManager.java:253)
at com.zimbra.cs.mailbox.DataSourceMailbox.importData (DataSourceMailbox.java:470)
at com.zimbra.cs.mailbox.DataSourceMailbox.syncAllLoc alDataSources(DataSourceMailbox.java:434)
at com.zimbra.cs.mailbox.DataSourceMailbox.sync(DataS ourceMailbox.java:486)
at com.zimbra.cs.mailbox.DataSourceMailbox.syncOnTime r(DataSourceMailbox.java:400)
at com.zimbra.cs.mailbox.SyncMailbox$1.run(SyncMailbo x.java:254)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: com.zimbra.common.service.ServiceException: system failure: Error while fetching message for UID 571
ExceptionId:sync-mbox-rick@att.net:1265986479001:577c3b4146da47a5
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE (ServiceException.java:248)
at com.zimbra.cs.datasource.ImapFolderSync.checkCanCo ntinue(ImapFolderSync.java:1144)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:802)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:720)
at com.zimbra.cs.datasource.ImapFolderSync.syncMessag es(ImapFolderSync.java:239)
at com.zimbra.cs.datasource.ImapSync.syncMessages(Ima pSync.java:304)
... 12 more
Caused by: com.zimbra.cs.mailclient.MailException: Unexpected tag in response(expected C09 but got C08)
at com.zimbra.cs.mailclient.imap.ImapRequest.checkSta tus(ImapRequest.java:122)
at com.zimbra.cs.mailclient.imap.ImapRequest.sendChec kStatus(ImapRequest.java:113)
at com.zimbra.cs.mailclient.imap.ImapConnection.uidFe tch(ImapConnection.java:324)
at com.zimbra.cs.mailclient.imap.ImapConnection.uidFe tch(ImapConnection.java:370)
at com.zimbra.cs.mailclient.imap.ImapConnection.uidFe tch(ImapConnection.java:387)
at com.zimbra.cs.datasource.ImapFolderSync.fetchMessa ges(ImapFolderSync.java:798)
... 15 more

If issue persists please post description and debug information here.