one concern is if the flash drive comes loose - an open pst is easily
corrupted. I haven't had problems using an SD card with an archive pst - the
reader is built into my laptop, not attached via USB, so it won't come
loose.

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Diane Poremsky [MVP - Outlook]
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> Probably but it would be quite slow since Flash drives tend to be slower
> than hard drives and they're also not usuable an infinite number of times
> (a large amount but not infinite).
>
>> Can I use a USB flash drive to store my pst file instead of my hard disk?
>> I have Office 2003