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Old 06-08-2022, 07:01 PM
PHearn PHearn is offline Transition from Office 365 to Office Pro 2021 Windows 10 Transition from Office 365 to Office Pro 2021 Office 2021
Transition from Office 365 to Office Pro 2021
Join Date: Jun 2022
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Default Transition from Office 365 to Office Pro 2021

I have used MS Office on my desktop for many years. I switched from a standalone version to Office 365 on my desktop a couple of years ago. I have already purchased MS Office Pro 2021 and I’m getting ready to switch back to the standalone version.

I have two email accounts setup in Outlook, and therefore I have two ost files (they used to be pst files). I assume there is one ost file per email account. One of the ost files is older and much larger than the other one. I also access my two email accounts online at and the emails, folders, contacts, and calendars seem to stay synced automatically with my desktop Office 365.

I sometimes, but very rarely, use Excel and PowerPoint.

I’m not sure how to transition from O365 to Pro 2021. Do I just install the new Pro 2021 and it sees the O365 and transfers the ost files automatically? Will it guide me in the process? Will I need to uninstall (delete) O365 when the transfer is complete? Will all my emails and folders and contacts and calendars be in the new standalone Pro 2021 after I install it?

Since one of the ost files is many years old, when I switch back to the standalone version, should I start with a new ost file? It seems like that would get rid of any old crap left over from many years of use. Or would that be a bad idea? I really don’t have any idea what’s in an ost file.

Thank you in advance for help you can give me before I start this process.
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