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Yes, chat history can be downloaded after performing Content Search in Compliance & Security center by Office 365 admins. Your personal chat history is actually saved in your mailbox, which means
it can be exported as other mailbox items by admins. If you are not an Office 365 admin, please contact your admin to help you export it: In Content Search create a new search of your mailbox>choose Preview search results after the search completes> your personal
chats will show as IM in subject & type> choose Download Original Item to export them as .eml files.