Microsoft.Exchange.WebServices throws Exception - Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.

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  Hi All,

  I am using EWSService to Write the email data to Office 365 Mailbox. I am running the logic asynchronously.

  It throws me the following Exception while writing it. 

  Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.

  Is there anybody who face the same error previously and can help me to understand it more ?

  Thanks!

  Wednesday, September 16, 2020 10:41 AM