This free tool reports the number of entries in Outlook 2010/2013/2016 autocomplete list cache. Detailed report shows the full set of auto-complete data available.
Even if all Outlook contacts are lost or an angry employee deleted a customer base, there is another way to restore important contacts. Every time you send a message, Outlook stores selected recipients in Auto-Complete Lists and keeps them there, until they are deleted manually. These data are not available anywhere else, and many users are unaware this is not the Outlook contacts, but individual data.
This report shows the number of contacts in AutoComplete lists for all connected mailboxes and accounts in Outlook 2010 and above. In advanced mode, the report shows all contacts for each account in your Outlook profile: name, email address (including X.500), and other fields. The creation of this report is the easiest way to save all the information from the Auto-Complete Lists to a CSV file. The result is a ready-made contact list you can open in Excel, edit, and import back into Outlook contacts. This is an easy way to restore contacts with email addresses from AutoComplete Lists in case of loss of the contact list.
The utility can be useful in investigations and security audits. Auto-Complete Lists are stored inside the mailboxes, and there are no standard Outlook tools for viewing or editing them. Even if users delete all messages and contacts, they often forget about Auto-Complete Lists, which clearly shows recent recipients. If you don't want to leave any contacts on the computer, run this report, and make sure you haven't forgotten to delete anything.
Command line allows you to export Auto-Complete Lists from PST data files and mailboxes of other users in bulk.

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