Office365 Contacts Migration to HubSpot

I have roughly 8,000 names sitting in Microsoft Office 365 and I’m moving everything into HubSpot CRM. Before the import happens I want the database properly scrubbed: identify and merge duplicates, flag... (Budget: £250 - £750 GBP, Jobs: CRM, Data Entry, Data Management, Database Administration, Email Marketing, Excel, Hubspot, Office 365, Zoho)