Standard to Express ?

Hi, This is a really basic SQL question. I need to remove a SQL 2005 Standard device from my network, but I want to keep the database which is around 1Gb. This is just for historic reasons, I do not plan on adding any more data to it however the only box I have available that I can move this to currently runs 2005 Express. Is it technically feasible to move this? if you Google this obviously it always seems to be a question of Express to Standard but never in reverse.
Thanks for looking
Bob
Reno ......
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