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YashwantChauhan-8202 asked joyceshen-MSFT commented

Public Folders of 1TB migration from On-Premisis to Office 365 exchange online

We have Public Folders of 1TB size in On-Premises Server. We Need to migrate it to exchange online. Any suggestion how to do it successfully without malfunction.

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joyceshen-MSFT answered

Hi @YashwantChauhan-8202

What's your on-prem Exchange server and CU version? Generally we use the migration script to meet this need. The official document gives step-by-step guide to perform this.

For Exchange 2013 and later version: Use batch migration to migrate Exchange Server public folders to Exchange Online

For Exchange 2010: Use batch migration to migrate legacy public folders to Microsoft 365 or Office 365 and Exchange Online

Please also refer to the public folder related limits in Exchange online: Exchange Online limits. And FAQ about public folder migration


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Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.