ot ipaq question

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Hi,

I have an Ipaq 5450 which I am using to put appointments into the
diary. The thing is that any appointment more than two months ago
disappears from the ipaqs memory. I guess it deletes them to save
valuable space.

Is there a way to stop this, and are the appointments stored on the
host pc when the ipaq is synchronised or are they deleted from there
too?

Thanks.