Last Updated: December 14, 2018
When you drag and drop an email while holding down the Option key, the expected behavior of copying the email does not occur. Instead, the email is moved.
Microsoft is aware of and investigating this issue. As a workaround, you can do the following:
Select the message that you want to copy. To select multiple items, hold down the cmd key as you click the items.
On the Home tab, click Move > Copy to folder.
Start typing the name of the destination folder.
When the folder you want appears, click the folder name and then click Copy.
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