Stellar Knowledge Base


 Modified on: June 8, 2020 |    603 views

IMAPISession: MAPI_E_UNKNOWN_FLAGS Error is encountered when a user is trying to export the mailboxes of an Exchange Database (EDB) file to Office 365. Refer to screenshot below

To avoid the error in EDB to PST converter software , take the following factors into consideration before exporting EDB-mailbox data to Office 365:

  1. Check that there is an active Office 365 account for which the data is to be exported.
  2. System used for exporting mailbox data should be a part of ‘Workgroup’. It should not be a part of any Exchange domain.
  3. Check that Outlook profile is not synced with an Exchange account. Remove the Outlook profile if it is synced with Exchange Server.
  4. Check that the Outlook profile is synced with Office 365 account.



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Stellar Converter for EDBStellar Converter for EDB is a professional tool that proficiently converts online as well as offline Exchange Server database (EDB) files into Outlook PST files. Performs Single or Multiple Mailboxes Extraction as per requirement.

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