![]() ![]() This limit applies only to the public folder. Anything more than 25GB will need to be cleared out. Check the size of your public folders.The same applies to on-premises Exchange Server. You need to ensure that the account performing the upgrade is a member of the Organization Management Role Group in Exchange Online.Otherwise, your migration process will fail. ![]() If you have to upgrade Exchange 2013 or 2016 to a supported version, you need to prepare Active Directory.Microsoft strongly suggests reviewing this document before attempting any migration.There are some other prerequisites or requirements you need to take note of for successful migration. If you are running in coexistence mode ( Exchange 2013 coexisting with Exchange 2016 or Exchange 2019), you need to ensure that Exchange 2013 is on CU15 as a minimum. Exchange Server 2019 does not have any prerequisites when it comes to CU as all versions are supported, according to Microsoft.Here are the versions/cumulative update (CU) your environment needs to be on: However, if you want to migrate public folders from Exchange 2013, Exchange 2016, or Exchange 2019 to Microsoft 365, you need to ensure that you are on a version that is supported. Migrating public folders from one Exchange Server version to another is not a difficult task if you’re migrating from Exchange 2013 to Exchange 2016/2019. ![]()
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May 2023
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