Providing a backup for an exchange mail server

I have a client who runs their own exchange server. They are asking me if I can provide a backup mail spooling for their email should their exchange server go down. There is in fact a scheduled outage next week that they want to use me for -- to collect their messages while they are down.

Does anyone know how this can be done? Can I use a linux server to collect their mail, or must I use a windows box with exchange?

 

 

 

 

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