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memory issue while extract messages from large pst file

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Hi

Our tool extract each message from pst file, save it, then remove some messages and add some new messages into this pst file.
For some large pst file, the tool run out of memory quickly. 
From dump file, it is running Aspose.Email.Outlook.Pst.PersonalStorage.ExtractMessage.
We used perfview to analysis the dump file, it shows there are 11K instances of Aspose.Email!Aspose.Email.Outlook.MapiMessageReader with more than 16G memory usage (14G are MemoryStream)
What does MapiMessageReader use for? is there possible memory leak? 

The version is 16.11.0.0

Thanks
Li





































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