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I'm using Outlook 2010 with Exchange 2007.

I am moving emails from my Deleted Items folder to a user-created folder. When I move a "low" number of messages, say a few hundred or less, the operation completes successfully. When I move a "large" number of messages (in this example it's over 800) I get the message shown in the screenshot below.

If I click Yes, a new email is generated and has links to all the emails I selected in the Attachment field. When I cancel that email, not only have the messages not moved but they appear to be deleted entirely.

What does the message mean and why does it get presented?

Why does clicking Yes do the behavior I described above?

enter image description here

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up vote 9 down vote accepted

I had this same problem yesterday and it has something to do with a calendar item in the folder you are trying to move the items from. I selected everything except for this calendar item and it worked fine without the error.

I deleted the calendar item and moved the remaining items to my archive folder.

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what I believe it's trying to do behind the scenes, is recreate those calendar events. But somehow thinks that they are all calendar events when it goes through the folder. Sounds like a bug in Outlook – Anthony Shaw Mar 17 '11 at 14:16
This behavior affects multiple versions of Outlook (for many years now). I typically sort by Icon in order to isolate the problem types, which include some other non-message types. I also want to know how can we move all of the items? – sage Jul 7 '11 at 15:15

Microsoft has provided official guidance relating to this issue: Moving multiple items from Deleted Items creates confusing warning about creating new items

It does indeed have to do with the fact that you are trying to move non-email message types (such as meeting requests etc.). Which, coincidentally happens when you are selecting more than 800 items at a time.

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