Does anyone have a 'FLOSS' (free/libre/open source software) duplicate email detector that will search Outlook PST files and compare emails in the same folder and find duplicates?
If the duplicates are the result of a recent import process, you may be able to remove them without a utility using the process described here. I can't vouch for it, but Vaita Outlook Duplicate Items Remover claims to do the job and is free, but is not open source.
If the duplicates are the result of a recent import process, you may be able to remove them without a utility using the process described here. I can't vouch for it, but Vaita Outlook Duplicate Items Remover claims to do the job and is free, but is not open source.