How is the Exchange Online Archive searched? Client or server?

I have a User that will be Transferring over 70GB of mail to an Office 365 Online Archive mailbox.
How is the Exchange Online Archive searched?   Typically the search seems to be done via outlook client and the local Windows Indexer service, though for this person its choking on the 70GB of mail. Will the Exchange Online Server be servicing the Search request and providing results or is it still up to the local Outlook Client and Indexer to index the content in the On-lIne Archive mailbox?

Scott TownsendIT DirectorAsked:
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David Johnson, CD, MVPOwnerCommented:
Archive is on the server not the client

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