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Why do results of recovery contain less data than the original Exchange Server OST file?

April 26, 2017contain Data exchange file original recovery results server

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Why do results of recovery contain less data than the original Exchange Server OST file?

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This is normal. The damaged parts of your Exchange Server OST file will convert to zero size on output. The other common reason of file size decrease is when some of features of the original OST file are not supported and therefore absent from the recovered OST file. Demo-recovered OST file is smaller because it mostly consists of demo placeholders than actual data.