Member Avatar for Ray_9

Hi there.

I need 'ost to pst' conversion MAC software. Preferably online.

Can anyone advise me a good one?

Edited by Ray_9
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  • Latest Post Latest Post by happygeek

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Quick reality check for : an OST is a cached, profile‑bound copy of a mailbox, not a portable archive. Microsoft does not support importing or directly converting an .ost file. The supported path to a .pst is to export from Outlook for Windows after connecting to the mailbox. See Microsoft’s own overview of PST vs. OST and limitations here: Introduction to Outlook data files.

Safest workflow from a Mac-only setup:

  • Use any Windows PC (or a Windows VM in Parallels/VirtualBox) with Outlook installed.
  • Add the same mailbox the OST came from and let it fully sync.
  • Export to PST: File > Open & Export > Import/Export > Export to a file > Outlook Data File (.pst). Microsoft’s steps: Export to a .pst.
  • Move the PST to your Mac. If you need to read/merge it there, switch to Legacy Outlook for Mac and import: File > Import > Outlook for Windows archive (.pst). Note: PST import is only in Legacy Outlook for Mac, not New Outlook. Details: Import into Outlook for Mac.

If the OST is orphaned and you cannot reach the server, there’s no Microsoft-supported way to open it. Either ask your Exchange/Microsoft 365 admin to export the mailbox to PST via eDiscovery, or evaluate a Windows recovery tool with care. Avoid uploading corporate mail stores to “online converters” for privacy and compliance reasons. ’s caution about one-post recommendations is well placed. Can you confirm whether you still have access to the original mailbox? That decides the path.

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Member Avatar for happygeek

Work your way through this lot https://goo.gl/waZMXd before the spammers start arriving with suggestions.

By the way, asking that question, in that way, is typical of the conversion software bait and spam brigade. Care to expand upon what your actually problem is, in an attempt to prove to the community here you are not part of a spamming club such as that?

Member Avatar for Fred_3

I would suggest this one https://www.osttopst.online/
You can also perform the conversion by exporting the contents of OST file to PST file.

Member Avatar for happygeek

And there we go, as predicted, a member (who joined DaniWeb just a few hours after the OP funnily enough) makes one post recommending a service. The the OP immediately marks the thread as solved. Now where have I seen this pattern before?

commented: My answer is "When we have a shill post a question." +12
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