Summary: System upgrades, abrupt Outlook application shutdown, oversized data files are some of the common reasons which may cause Outlook error: “Outlook PST was not cleanly closed by the last program that used it.”And the outcome is that the user is unable to access the Outlook profile in Microsoft Outlook 2019, 2016, 2013, 2010, 2007, 2003 and earlier … Outlook for Mac keeps asking for the password. If Outlook for Mac is offline then, you cannot send or receive email messages.
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