store.exe using more than 500MB of RAM ?!?

Is it normal that the store.exe process on my SBS 2003 premium uses more
than half a gig of RAM?
 
This server "only" has 2GB of RAM and I'd hate to see store.exe use even
more RAM.
 
Why is this happening, is it a big issue and how can I remedy it?
 
Thanks in advance!

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