KB ID 0000343
You have a nasty email that contains a virus or some offensive content and you want to delete ALL instances of it.
1. Log on as the domain administrator > Open the Exchange Command Shell.
2. First grant the correct rights to the administrator account.
This gives the Administrator FULL rights to ALL mailbox’s
Note: this assumes your mailbox database is called “Mailbox Database”.
3. Then locate and delete the emails containing “yoursearchtext”.
Note: If you are unable to use the export-mailbox command then see here
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