Accessing Outlook .pst files in New Outlook

This answer is a non-starter. The main reason people export to PST is because of email storage limitation of 50Gb and 100GB if you use In-Place-Archiving. You can't just put all that historical mail back in outlook!!! The whole point of having a PST file is to hold historical email records for referencing in the future. So being able to mount the file is crucial for I would say every business on the planet not to mention Governments.

This is an interesting thread and many customers have taken a long time to describe their issues which is the same issue I am having. I cannot believe that Microsoft can only reply with a standard response which doesn't address anyone concern.

In one case "sbdeco" provides a very clear concern then Microsoft reply and when "sbdeco" replies again with other obvious questions, Microsoft does not reply again. However further down they use their initial standard response again with another customer query so basically ignoring "sbdeco".

Microsoft should not be offering this upgrade to the new outlook until it can solve this important issue. How can customers keep their emails on local drives and still view them without having to load their archived emails back into Outlook online using the Microsoft servers and then we are being charged for additional storage. I feel much safer having my archived emails on my own storage device and I do not want this admin created by Microsoft.

I have a similar file size problem, although my total file size is "only" 29GB with over 3 dozen .pst files (many of them with many subfolders).

However, I have two serious additional problems:

(1) I am a contract technical editor, and some of my clients email me highly confidential technical material. For security and patentability reasons, they require me to ensure that their emails are securely held on my system only and are never stored on an outside server. How can I access all my important .pst files with the new Outlook, without losing or betraying(!) these clients?

(2) Through some sort of inadvertent keyboarding error that happened while I was typing an email to a client late at night, I unintentionally and unwillingly gave permission for Microsoft to update my Outlook installation immediately. There was no "Are you sure?" pop-up message. As a result I HAVE LOST ACCESS TO ALL MY .PST FILES, AND I CANNOT FIGURE OUT HOW TO GET ACCESS TO THEM AGAIN.

These .pst business files are all still intact in a folder within my desktop, but I I don't know how to access their content with the new Outlook. Also, I may lose some important clients if I cannot prevent the uploading of their files to a Microsoft server in the cloud.

I'm no email tech expert, but can see no way to fix this situation using the new Outlook.

To provide a temporary solution, how can I revert back to the old Outlook?

Or, after being a Microsoft email user since the 1990s, do I need to immediately migrate my email system to a different email provider that can actually meet my business needs???

This problem is time critical: please answer as soon as possible. Thanks.

You are not being clear for me. Will one move their .pst files "Back" into the old classic outlook, and then into the new Outlook, or just move the .pst files "forward" into the new Outlook?

Here's the information from current roadmap item for adding PST support: