Using New Outlook on Windows for personal email, calendar, and contact management
Hi TWITCH,
I understand that you want to protect your emails before removing the BigPond account.
You do not need to create an .ost file first. In new Outlook for Windows, the safer option is to export the emails you want to keep to a .pst file. Go to Settings > Files > Export, select the BigPond mailbox or the required folders, and follow the export wizard. Before removing the account, please verify that the exported file contains the emails you need.
Could you also clarify whether you only want to remove the BigPond account from Outlook or permanently close the email address with Telstra? Removing it from Outlook will not close the email service itself.
For more information, see Export emails, contacts, and calendar items using a .pst file. Thank you so much for your understanding.
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