Import/Export, ZD to ZD - not all emails imported
I'm failing to recover my email with Import/Export feature.
I used the export functionality to backup my mail from Zimbra desktop to tgz archives - this worked well for both my email accounts.
Afterwards I reinstalled the OS and I imported the mail to Zimbra Desktop with the import feature. One account imported well, in the other I have problems: the folder structure was imported correctly, but only a fraction of emails are in the folders.
Moving the mouse over the account name in Zimbra desktop shows the right size of the mail account in MBs - as it was in the old zimbra before reinstallation.
All emails that are present in the folders after the import are dated 2011, there is nothing more recent.
Many thanks in advance for ideas!