Use Microsoft Exchange Server MAPI Editor (MFCMAPI) to change the PR_CONTAINER_CLASS property of the folder to IPF.Note. PR_CONTAINER_CLASS_W, PidTagContainerClass PR_CONTAINER_CLASS, PR_CONTAINER_CLASS_A, ptagContainerClass An analysis of the folder properties shows the following results: If you've used Mail to create email accounts, select Mail > Add Account. This issue occurs if the folders in the Exchange mailbox were created by using an unrecognized class of type IPF.Imap. If you're running Mac OS X version 10.10 or later, follow these steps to set up an Exchange email account: Open Mail, and then do one of the following: If you've never used Mail to set up an email account, the Welcome to Mail page opens. The Mail folder (located in your home Library folder) may be excluded from Spotlight searching. If you need more help, visit the Mail Support website. To explore the Mail User Guide, click Table of Contents at the top of the page, or enter a word or phrase in the search field.

If the Mail & Messages checkbox isn’t already selected, select it. It’s easy to find an email message, no matter which mailbox or folder it’s hiding in. To check, choose Apple menu > System Preferences, click Spotlight, then click.

You can't view one or more folders in a user's mailbox on a Microsoft Exchange ActiveSync client or in Microsoft Outlook after the user's mailbox is migrated from an Internet Mail Access Protocol (IMAP) messaging system to Office 365 or on-premises Microsoft Exchange Server. Mail may be excluded from Spotlight searching.

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