For automated and quick duplicate management and elimination in Outlook, I suggest the use of the Regain Outlook Duplicate Remover Tool. This powerful software enables you to easily delete duplicate emails, contacts, tasks, and calendar entries from PST, OST, and BAK files. It provides the option to search for duplicates on multiple parameters, such as the sender, subject, and date, and do it thoroughly. The software itself is supported by all versions of Outlook, including Outlook 2021, Outlook 2019, Outlook 2016, and Outlook 365, and both ANSI and Unicode PST files (i.e., files containing an American Standard Code for Information Interchange standard, or ANSI, and a Unicode standard, which eliminates the encoding of text and solves the problem of compatibility between different character sets (i.e., Unicode). Its easy-to-use interface and free trial version let you begin the task of duplicate removal easily.

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