Exported PST is empty when exporting a not cached folder in Outlook

sebastian 141 Reputation points


I tried to export a PST file from a users mailbox folder that he can import the PST file again in his online archive.

After the export the PST file is only 265kb big and empty.

The folder is not cached in Outlook:
* Serverfolder contains: 6 items
* Offline folder contains: 0 items

When I try it with a cached folder the PST File is not empty.

The users mailbox is 50GB therefore I can not cache all of his files.

Are only the cached files exported to a PST file?
Is there a possibility for exporting all files of the folder without caching all items of the folder?
Or can you download/cache a single folder without caching the entire mailbox?


Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
4,875 questions
{count} votes

Accepted answer
  1. Robert Sparnaaij [MVP] 1,811 Reputation points MVP

    Exporting only exports the cached content and not what is only available online.

    Caching applies to the entire mailbox. However, you can set sync filters at folder level (Right click folder-> Properties-> Synchronization-> button Filter...) to reduce the amount of data that gets synced for that folder.

    Caching a 50GB mailbox into an ost-file is possible and will leave you most likely with an ost-file smaller than 50GB as some parts will be stored in a compressed way within the ost-file.

    However, instead of doing this client-side, consider using Retention Policies and/or Retention Tags so the items will be moved automatically within the service.
    See: Retention tags and retention policies in Exchange Online

    1 person found this answer helpful.
    0 comments No comments

0 additional answers

Sort by: Most helpful