Last September, we officially announced the increase of the supported limit of Public Folders in Exchange Online from 100,000 to 250,000. In line with our efforts to scale Public Folders even further...
Updated Jan 19, 2021
Version 3.0
Blog Post
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Announcing the increase of the Public Folder limit in Exchange Online from 250,000 to 500,000 folders
Awesome! I'd also love to see the 1,000,000 item limit be increased for the underlying public folder mailboxes. At the least, the migration scripts should build better mappings based on this information and hard fail if a single folder is too big.
- +1 Mike
An automated public folder mailbox management would be fine, too.