Email data file created by Zimbra Connector for Microsoft Outlook (ZCO), a plug-in for Outlook used to manage Zimbra email accounts; saved in the Outlook .PST format but uses the ".zdb" extension instead; can be imported into an Outlook profile by first renaming the file extension to ".pst." ZDB files are named zimbra.zdb by default.
Encrypted file format used by the U.S. military and Department of Defense for Electronic Personal Security Questionnaire (EPSQ) documents; most often used for the Standard Form (SF) 86 Questionnaire, which is used by military personnel, government employees, and government contractors to apply for a Security Clearance.
Older file type used to store Quicken financial data.