We are using Zimbra Desktop 7.2.2 GA (build 11951) with hosted IMAP mailboxes. When searching the email inbox for specific emails, the results only go back to the beginning of the year, even though there are emails received prior to this period. I tried reindexing the mailbox a few times, but to no avail.

Are there limitations with the search functionality? Can I make any changes to extend the search period?