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betaPublisher announcementMailbox import and export · October 2026

Mailbox import and export: 2 API change passages

What Microsoft published

Month-dated announcement

Added the isHidden property to the mailboxFolder resource to identify hidden mailbox folders. Use the existing includeHiddenFolders query parameter for listing folders and listing child folders . Set it to true to include both hidden and nonhidden folders.

2 individual passage citations
3 API documentation links
Observed announcement history and complete recorded revisions

What changed

First observed 21 Oct 2026

No field changes in the recorded history.

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An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 21 Oct 11:34 UTC · 259 of 260 readable · 257 fully read · documentation 416/439 current