Why convert RPMSG to PST?
A .rpmsg file is a zlib-compressed, IRM-protected container; decryption keys are issued per-recipient by Microsoft's cloud service. A PST file is a local Outlook mailbox archive storing messages Outlook has already decrypted and rendered - moving an encrypted blob into a PST does not make it readable.
How to convert RPMSG to PST
Microsoft Outlook APP
Open the email in Microsoft Outlook signed in as the recipient; if the sender's rights policy permits it, drag the decrypted message to a local PST folder to archive it.
Microsoft Outlook for Mac APP
Open the email in Microsoft Outlook for Mac signed in as the recipient address; Outlook fetches the license and renders the message automatically.
Programs that convert RPMSG
About these formats
.RPMSG
Restricted Permission Message
An RPMSG file (almost always named message.rpmsg) is an encrypted, rights-protected email container created by Microsoft Outlook when the sender applies Information Rights Management (IRM).…
Open .RPMSG details →
.PST
Outlook Personal Storage Table
A PST file is a Microsoft Outlook database that stores an entire mailbox in one file - emails, contacts, calendar appointments, tasks, and notes. The standard way to open it is Microsoft…
Open .PST details →Quality & what to watch
- Converter tools that advertise RPMSG-to-PST copy the encrypted container into the PST file - the message remains encrypted and unreadable inside it.
- If the rights policy includes 'Do Not Forward' or blocks saving, dragging the message to a local PST folder will be prevented by Outlook.
- If you received the protected message in Gmail or another client, look for a 'Read the message' link that opens the content in Microsoft's Purview encrypted-message portal.
