You can export certain reports to Excel or CSV by clicking on Download in the top right-hand corner of the report screen, and then selecting he format in which you would like to download the report.
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The following reports can be exported into Excel or CSV:
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Overview
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Contacts
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Trend
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Teams
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Shared / Group Mailboxes
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Conversation Logs
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Message Logs
NOTE: Exporting from the conversation log will only provide the first emails for each conversation. If you export from the messages log you will receive ALL email data.