Use MDB_ONLINE when calling OpenMsgStore.Select the Tools menu, then select Options.Download MFCMAPI (scroll down and then select Latest release).

Use MFCMapi to identify the duplicate folders. To delete the duplicate items, follow these steps:Įxit Outlook and close OWA on all workstations that are connected to the user mailbox. We recommend that you back up Outlook data or make sure that the Exchange Server mailbox has been backed up before you proceed with these steps. The following steps may result in data loss if you do not follow them exactly as written. Other factors could also contribute to the issue described in the Symptoms section of this article. Or, the unexpected duplication may be the result of Exchange Server mailbox maintenance or of other changes that are performed on the computer that is running Exchange Server. CauseĪ mobile device or a third-party server application that synchronizes with the Exchange Server mailbox may unexpectedly introduce the duplication. In Microsoft Outlook, you see duplicate folders in your Microsoft Exchange Server mailbox when you view the Outlook folder list, or when you view the folder list by using Outlook Web App (OWA).

Delete duplicates in outlook 2013