CauseĪ mobile device or a third-party server application that synchronizes with the Exchange Server mailbox may unexpectedly introduce the duplication. 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. Other factors could also contribute to the issue described in the Symptoms section of this article. The following steps may result in data loss if you do not follow them exactly as written. 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. To delete the duplicate items, follow these steps:Įxit Outlook and close OWA on all workstations that are connected to the user mailbox. Use MFCMapi to identify the duplicate folders.Download MFCMAPI (scroll down and then select Latest release).Select the Tools menu, then select Options.Use MDB_ONLINE when calling OpenMsgStore.If you are prompted for a profile, select your profile name, and then select OK.
To identify the duplicate folder, select one of the duplicate folders on the left pane.In the navigation pane (left-side pane), expand Root Container, and then expand Top of Information Store.In the top pane, locate the line that corresponds to your mailbox, and double-click it. In the right pane, locate the Value column for the PR_CREATION_TIME property. Compare this value to the duplicate folder with the same name. The duplicate folder will have a newer creation date and time.
Work with one pair of folders at a time (for example, start with the two Calendar folders that appear). Use MFCMAPI to copy any items from the duplicate folder to the original folder. These are items created after the duplicate folders were created. This can include email that was received in the Inbox, Contacts that were created, Calendar appointments that you scheduled and meetings that you accepted.
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