You can install these packages from NuGet, or place their DLL’s in the same folder as the script. Using the Remove-DuplicateItems.p1 script requires Exchange Web Services (EWS) Managed API and for OAuth authentication the Microsoft Authentication Library (MSAL) libraries. Wouldn’t it be nice if you’d have a PowerShell script you can conveniently run from any workstation (or server) with PowerShell installed, removing those duplicate items from a user’s mailbox remotely? If the answer is yes, the Remove-DuplicateItems.ps1 script may be something for you. When you’re an Apple shop you’ll require different tools, unless you’re running a Windows desktop somewhere (I’ll just pretend I didn’t hear you saying ‘Why don’t you install the tool on the Exchange server’). When you finally have selected a tool, in most cases they require installation of a piece of software and someone to perform the removal process using the tool or Outlook with add-in. Not all this software is free (some even require payment per duplicate removal of appointments, contacts or e-mail) and some might not even work (MAPI-based tools may not work against Exchange 2013). When continuing your search, you’ll find lots (I mean lots!) of tools and Outlook add-ins, like Vaita’s DIR or MAPILab’s Duplicate Remover. This article describes a manual procedure to remove duplicates entries from your calendar, contacts, inbox or other folders. When looking for a solution, you’ll probably encounter MSKB299349, “How to remove duplicate imported items in Outlook”. Accidental import from – for example – a PST file to a mailbox can lead to duplicate entries. In the past, I’ve seen this happening with Nokia PC Suite and Google Apps Sync for example
Entries from the mailbox are treated as new entries and as a consequence are added to the mailbox when synchronizing information back to the mailbox, creating duplicates.
Duplicate items can be caused by many things, but most common are: For those involved with Exchange migration projects or managing Exchange environments, at some point you probably have experienced the situation where people ended up with duplicate items in their mailbox.
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