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Outlook Hotmail Connector producing immense OST files

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When checking the size of the Outlook folder for my Hotmail account, Outlook 2010 was displaying the total size as 2.5 GB. The total size on disk was 50GB. Thinking that the OST file was corrupt, I ran scanpst on the OST file. It found errors but broke the integration with Hotmail (the usual send/receive error that I have yet to see a resolution on.). So I backed up the old OST file, setup a new connection to Hotmail and re-downloaded everything locally. The local file was 2.5GB. Fast forward a week and my OST file is back up to 50GB. What's causing the OST file to grow to 20x the size of the actual messages? Indexing information? Is there a way to prevent this file from getting that large? When it hits 50GB the system's disk thrashes and apps freeze based on what must be blocking calls to the drive - and I'm on an SSD!

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