Looks like Outlook 2007 is limited to sending emails to 50-70 Contacts at one
time. How many Contacts can you email at one time with Business Contact Mgr?
BCM itself (the add-in in Outlook) doesn't manage emails itself.
However, BCM's EMS service should not have a limit on the number of
emails. Although the EMS service will send out the emails using its
own schedule--all the emails may not leave all at "at one time."
Note that your ISP may also impose limits on number of emails you can
send.