The operation cannot be performed because the message has been changed
https://www.officelivesupport.com/fix-error-message-operation-performed-message-changed/
The error that pops up is “The Operation Cannot Be Performed Because The Message Has Been Changed”. When we receive an error message while sending or opening an email in Microsoft Outlook on web, see the cause and understand how to fix it.
Description:
The messages affected shows that the Outlook automatically saved a draft while editing them.
If you create a new message type quickly, and send it before it is saved as drafts. The message will be send.
However, If you take time to compose the message and Outlook it will be saved in draft, the message “The Operation Cannot Be Performed Because The Message Has Been Changed” pops up.
The message that Outlook thinks has changed is the one in the drafts folder, and the send fails because it cannot delete the draft as part of the send operation.
This Error message applies to all versions of windows like Windows 10, Windows 8 & 8.1, and Windows 7.
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