Missing Emails

July 28, 2018 | by iaur | posted as Failure, Outlook 365

Scenario: You did migrate from an IMAP mail host to Microsoft 365 and some mails are missing

Method 1:

• Compare folder size of OWA and OLK (local vs server data)
• Turning OFF cache mode as well
• Try searching for the email in OWA and OLK

Method 2:

Try resetting the Outlook view or delete any view filters.

• https://support.office.com/en-us/article/create-change-or-customize-a-viewf693f3d9-0037-4fa0-9376-3a57b6337b71

Method 3

• Download MFCMAPI from http://mfcmapi.codeplex.com, and then run it.

• If you have 64 bit office, you need 64 bit MFCMAPI.
• Open MFCMAPI, go to Session, Logon
• Select your profile
• Double-click on the affected data store.
• Expand Root – Mailbox
• Expand Top of Information Store or IPM_Subtree
• Select Inbox
• Look for PR_CONTAINER_CLASS in the right pane, double-click on it.
• Change IPF.IMAP to IPF.Note then click OK to close the dialog.
• You’ll need to do this to each folder that is affected.

From <https://support.microsoft.com/en-us/help/3050475/you-can-t-view-mailbox-folders-on-an-exchange-activesync-or-outlook-cl>