MailStore – Missing folders when archiving M365 mailboxes via Graph API
Summary
The behavior described does not indicate a defect in MailStore;
instead, it must be checked whether the corresponding folders were created as ipf.note.
Cause
Using the Microsoft tool MFCMapi, you can access the mailbox via MAPI by going to Session -> Logon -> “Choose Profile.”
Then, select either your own mailbox or a shared mailbox.
Next, open the “Root” and then “IPM_SUBTREE”; this is where the actual folders are displayed.
If you select one of the folders that does not appear in MailStore and check the PR_CONTAINER_CLASS attribute
on the right-hand side, it must show “IPF.Note”.
https://github.com/microsoft/mfcmapi/releases
Resolution
If the container class is `ipf.imap`, it must be changed to `ipf.note`, as Microsoft Graph Explorer can only access the latter.
MailStore uses this to access the Graph API.
Change from ipf.imap to ipf.note