User sees half of its Inbox emails

User sees half of its Inbox emails

Problem

When a user logs into his account, he sees half of his Inbox emails.

Resolution

1. Click on the Calendar tab
2. See if there is a crossed shared calendar on the left side.
3. If there is anything like that, delete it, log out and log in.
4. The emails should be seen now.

Additional Information

When the cause of the problem is the shared non-existent calendar, we see the following in the mailbox.log:

2016-01-14 11:52:04,545 WARN [qtp509886383-1213195:http://10.0.0.1:80/service/soap/SearchRequest] [name=user@example.com;mid=115;ip=10.0.0.1;ua=ZimbraWebClient - GC47  (Linux)/8.6.0_GA_1182;] SoapEngine - handler exception
java.lang.NullPointerException
at com.zimbra.cs.mailbox.Message.manageCalendar(Message.java:636)
at com.zimbra.cs.mailbox.Message.getRemoteCalendarItem(Message.java:674)
at com.zimbra.cs.service.mail.ToXML.encodeInvitesForMessage(ToXML.java:2389)
at com.zimbra.cs.service.mail.ToXML.encodeMessageSummary(ToXML.java:1938)
at com.zimbra.cs.service.mail.SearchResponse.add(SearchResponse.java:263)