Finally nailed down the exchange problem. It was caused by a very stupid

Finally nailed down the exchange problem. It was caused by a very stupid
mistake from me. I didn't ended the query with \r\n but ended it with \n. I
should have known better.
An interesting discovery was that setting the number of queries to process
at once influence performance. A higher number doesn't mean more performance.
In our tests 128 was slower then 32 (on Exchange 2000).

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