You will need to generate a report of all mailboxes, shared mailboxes, and public folders which you have in the Exchange Server, including the size and item count of each resource. So, before the actual migration, during the planning, one must analyze the data being migrated and consider upgrading some users from one subscription to another.īefore purchasing or committing to an engagement, it is important to first gather the current assets. This depends on the subscription that you will go for. This is not a problem but when it comes to migrating to Microsoft 365, they might end up with some issues. Still, most clients don’t impose this limit and end up having large mailboxes. The limit can be imposed manually by the business.
However, you need to increase the resources in the storage, backup, and performance of the server. On-premises Exchange Server 2016 or 2019 will not impose any limit on the size of the mailbox.
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