Remove Duplicates in Outlook. Open Outlook, and click the 'Calendar' element. Verify that your events still appear on your calendar and that there is only one entry. If entries are.

Outlook for Office 365 Outlook 2019 Outlook 2016 Outlook 2013 Outlook 2010 Outlook 2007 When you import calendar items into Outlook, if you select the Allow duplicates to be created option in the Import and Export Wizard, items already in your Calendar are duplicated. To remove duplicate items from your Calendar, do the following: • In Calendar, in the Navigation Pane, select the Calendar folder. • On the View tab, in the Current View group, click Change View, and then click List.

• Click the Subject column heading to arrange all the calendar items by subject. • Hold down CTRL while you click each duplicate calendar item in the list. • When you have selected all of the duplicate calendar items, press DELETE.

OK, I think what you're saying has to do with the variable getting garbage collected, presumably between invocations of SelectionChangeHandler. And that this means that the event handler deregistration doesn't work? Wouldn't it get garbage collected as soon as mailE started pointing at a different MailItem, though? I'm not sure what that has to do with ReleaseComObject in any case.

Since you seem to understand what's going on, could you explain a bit more why these steps work so I'm not just blindly applying changes without an understanding of why? – Jul 21 '16 at 6:59 •. Ahhh I think I see.

The removal of the event handler isn't working because the selected MailItem object isn't actually the same.NET object as before, even though it refers to the same Outlook object, and the event handling is on the level of the Outlook objects. By releasing the old COM object - effectively deconstructing the.NET object, or at least making it inert - I can keep there from being more than one 'live'.NET object and therefore more than one thing on which events will fire. I don't even need the removal of the event handler, if I understand right. Do I have this correct now? – Jul 22 '16 at 6:20 •. Thinking about it, this also explains why the code examples have stuff like the Explorers collection, active Explorer, and Inspectors collections all as class-level variables: I have event handlers on all of those, so I need them to stay in scope.

I wasn't sure, at the time, why all the code samples said to do it that way; they didn't explain. That's now a lot more understandable. Thank you for explaining! I was thinking of it as obtaining a reference to an object that already existed (the Explorers collection, the current MailItem, etc.), rather than making a new, and ephemeral, object. – Jul 22 '16 at 6:28 •.

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