You should use eSoftTools OST recovery Software to import OST files to the Zimbra desktop without losing your database. In comparison to other recovery software, it always gives results that are 100 times better. It has no trouble or issues importing OST files to the Zimbra desktop. It always comes with an easy-to-use interface, making. Additionally, it is suitable for anyone to use without professional assistance. You can import 25 items from each file for free by trying the free demo. 

To know more: Import OST files to the Zimbra desktop