OpManager Exchange 2010 SP3 Monitoring

OpManager Exchange 2010 SP3 Monitoring

Can any experienced OpManager users recommend some thresholds for monitoring an Exchange environment? 

Current:
1,037 Recipients
835 Mailboxes
829 OWA Users
841 ActiveSync Users
841 MAPI   Users
841 POP3   Users
841 IMAP4   Users

Thanks

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