Last month, Microsoft put up a blog post praising its New Outlook for Windows while explaining how its new mail app was, in many ways, much better than the classic app. The company also acknowledged that it was lagging in some areas compared to classic Outlook but assured that more and more new useful features would be seen on New Outlook.
The company specified offline features as well as PST support. Following that, Microsoft has now confirmed that it is indeed adding several new PST features to New Outlook for Windows very soon.
For those who may not be familiar with them, Outlook PST (personal storage table) files are Microsoft"s in-house data container files used by Outlook to store copies of mailbox items on the local computer. They hold email messages, calendar entries, contacts, tasks, and notes outside an Exchange Server or Office 365 account. PST files help enable offline access, personal archiving, and mailbox management, making them essential for backup and more.
Before we get into that, let"s have a quick look at some of the PST additions that have already made their way to the new app.
In June 2025, Microsoft debuted the ability to favorite folders, check out Profile card details with a click. In regard to mailing, the tech giant also added support for replying and forwarding emails via a PST file.
Following those, right now, the company is working on exporting features for Mailbox including auto-export scheduling support as confirmed by recent Microsoft 365 (M365) roadmap entries. It writes:
With this update of support for .pst files (a.k.a. Outlook Data File) in the new Outlook for Windows, users will be able to schedule an export of an entire mailbox (emails, calendars, and contacts) or a specific mailbox folder to a .pst file.
Microsoft expects to roll this feature out in July 2025, although there can always be delays. For example, the non-auto exporting option was originally planned for launch in June itself but that has since been pushed back to August 2025. You can find the entry here under ID 485743 on the M365 roadmap.
Following export support, Microsoft also intends to add Import support as well. This will work with emails, calendars, and contacts. The company writes:
With this update of support for .pst files (a.k.a. Outlook Data File) in the new Outlook for Windows, users will be able to import emails, calendars and contacts from .pst file to mailbox.
These are intended for release around October 2025. You can find the entries under IDs 485740 and 486840 on the M365 roadmap.
Another PST feature that is also already being delayed is the option to forward emails as attachments. You can find the entry here under ID 485750. The company initially intended its rollout this July, but that has also been pushed out to August.