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Is there any compression for pst output?

We are converting 30GB mailbox to pst format. Is there any compression algorithm used? It seems everything is in place, but in result we have only 12GB of data.

@mrila,

I have observed your requirements and request you to please share the details on your end along with used sample code. I doubt there is automatic compression mechanism available while fetching mails from client and adding to PST.

@mrila,

We have further explored the requirements. There is no explicit compression in our PST implementation, but the output may depend on the format of the input data. For example, the conversion may change the size of the message.

Also in PST, the named properties mapping data is global for all messages, and this can affect the final size of the data.