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Getting the following error on one of my Hotmail accounts (but not the other), nor my two Outlook.com accounts.
Help? Thoughts? Tips?

Failure communicating with remote server. Please try again later.

Debug message: Connection is closed

Exception:

com.zimbra.common.service.ServiceException: system failure: Folder sync failed
ExceptionId:sync-mbox-dave{MyEmailAddress}@hotmail.com:1492183190177:9f98ceca7bc328fa
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:254)
at com.zimbra.cs.datasource.imap.ImapSync.importData(ImapSync.java:169)
at com.zimbra.cs.datasource.imap.ImapSync.importData(ImapSync.java:136)
at com.zimbra.cs.offline.OfflineImport.importData(OfflineImport.java:101)
at com.zimbra.cs.datasource.DataSourceManager.importData(DataSourceManager.java:317)
at com.zimbra.cs.datasource.DataSourceManager.importData(DataSourceManager.java:277)
at com.zimbra.cs.mailbox.DataSourceMailbox.syncAllLocalDataSources(DataSourceMailbox.java:410)
at com.zimbra.cs.mailbox.DataSourceMailbox.sync(DataSourceMailbox.java:449)
at com.zimbra.cs.mailbox.DataSourceMailbox.syncOnTimer(DataSourceMailbox.java:377)
at com.zimbra.cs.mailbox.SyncMailbox$1.run(SyncMailbox.java:279)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
Caused by: com.zimbra.common.service.ServiceException: system failure: Synchronization of folder '/Spam' failed
ExceptionId:sync-mbox-dave{MyEmailAddress}@hotmail.com:1492183190177:9f98ceca7bc328fa
Code:service.FAILURE
at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:254)
at com.zimbra.cs.datasource.imap.ImapSync.syncFailed(ImapSync.java:388)
at com.zimbra.cs.datasource.imap.ImapSync.syncMessages(ImapSync.java:329)
at com.zimbra.cs.datasource.imap.ImapSync.syncFolders(ImapSync.java:239)
at com.zimbra.cs.datasource.imap.ImapSync.importData(ImapSync.java:164)
... 10 more
Caused by: java.io.IOException: Connection is closed
at com.zimbra.cs.mailclient.imap.ImapConnection.sendRequest(ImapConnection.java:498)
at com.zimbra.cs.mailclient.imap.ImapRequest.send(ImapRequest.java:95)
at com.zimbra.cs.mailclient.imap.ImapRequest.sendCheckStatus(ImapRequest.java:111)
at com.zimbra.cs.mailclient.imap.ImapConnection.doSelectOrExamine(ImapConnection.java:205)
at com.zimbra.cs.mailclient.imap.ImapConnection.select(ImapConnection.java:192)
at com.zimbra.cs.datasource.imap.RemoteFolder.select(RemoteFolder.java:198)
at com.zimbra.cs.datasource.imap.ImapFolderSync.syncMessages(ImapFolderSync.java:269)
at com.zimbra.cs.datasource.imap.ImapSync.syncMessages(ImapSync.java:326)
... 12 more