Exchange on integrated x Series

I am contemplating moving Exchange from an old Intel box that has space
limitations to the unused integrated server in my model 800.  Exchange is
performing poorly presently due to the old box and and increased number of
users.
 
Has anyone done this?  Good idea or bad?  If I do it, can I also install GFI
Mail Essentials on that server?  
 
I hope to gain performance and consolidate the backup.  However, it seems to
me that if I have to recover anything in Exchange I may be limited to
restoring all or nothing.  
 
Looking forward to your thoughts.
 
 
 
John P. Walsh
Suncoast Center for Community Mental Health
St. Petersburg, FL
727-327-7656 x 294
jwalsh@xxxxxxxxx