In general, it’s easy to rename a personal folder with the right-clicking menu on the Navigation Pane in Outlook. However, this method can’t change the name of an email account. Here, this article will show you the solution of renaming an email account in Outlook quickly.
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This renaming operation is only operative with "pop" accounts (.pst data file)
It can't be used with Microsoft exchange account (.ost data file)
I'm in such a situation and look forwards to find an other methode applicable to .ost data file