When you try to delete more than 4,000 messages at one
time, you may receive one of the following error messages:
There is not enough memory available to perform the
operation Some items could not be deleted.
They were either moved or
already deleted, or access was denied.
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This problem occurs because Microsoft Outlook can handle a
bulk deletion of no more than 4,000 messages when it is working with a server
message store.
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To work around this problem, delete fewer than 4,000
messages in a single operation.
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Microsoft
has confirmed that this is a problem in the Microsoft products that are listed
at the beginning of this article.
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