File Storage and Search - Migration from Outloook to Zendesk

Hello,

Is anybody using a storage software for Outlook emails and attachments that provides a Zendesk App to search for those files?

We are helping a customer migrate from Outlook to Zendesk and since they cannot search for attachments in Zendesk, an alternative like the previously described would be useful. I am not sure that Dropbox and do that:

https://www.zendesk.com/marketplace/apps/support/115221/dropbox/?queryID=96349e6e371767af124ff868d4c22dd8

Thanks.