To determine whether your Mac is susceptible to the issue described above, try the following steps: Remember that you can still always access email via the Outlook Web App. Since individual updates for Office on Mac cannot be uninstalled, the workaround for affected systems entails backing up certain files*, removing Microsoft Office, then reinstalling Office. If your Mac is running macOS High Sierra and you install update 16.12 for Outlook 2016, then Outlook will repeatedly (every 30 seconds or so) prompt for your email password. ISSUE: A recent software update for Microsoft Office on Mac computers can prevent Outlook from working properly.