10 Mistakes to Avoid When Migrating to Office 365 Cloud PBX from the Real World Office 365 Cloud PBX is an incredible way to get a lot of PBX functionality up and running in short order. And nearly anyone can do it. There are some things to be aware of to make things go as smooth as possible during rollout. 1-Porting Numbers: Get an Early Start & Have a Plan B Make sure you start this process at least 2 months prior to the date you want to go live. If you are not in a major metro area you are going want to submit phone numbers to verify that they can be ported well in advance of go live. Sometimes in areas outside major metros it just isn�t possible to port numbers and you want to know this up front. Note that even some telco�s may be listed as possible to port and Microsoft will not be able to, due to the inscrutability of various telco agreements. (we have experienced this with Frontier, for example) What happens if it just isn�t possible to port a number? See number 5...