we are moving from a 3rd party hosted exchange to Office 365. currently we have a C370 that all incoming emails go to, then it is sent to the 3rd party email system. we still want to use our C370 applicance when we move to Office 365.
When we will be switching from 3rd paty email to Office 365 there will be a 24hr to 48hr period of quasi downtime.
anyway. can the C370 be configured to hold all incoming emails and not try to deliver them or send any NDR's for the 48hr period.
then when Office 365 is fully ready we can point the ironport box to Office 365. then send all the emails ironport is holding to Office 365.
what is the best way to do this.