How to FILTER virtual table

Hi Team,
I need a caculated table with names of costumers, who purchased something in 2 monthes, from period
So i made an example table 
I need somehow FILTER that virtual table so that only costumers who have "AmountM" = 2 remain

Table 2 =

CALCULATETABLE(

SUMMARIZE(Orders,

Orders[Customer ID],

"AmountM", COUNT('Calendar'[MonthYear])),

DATESBETWEEN('Calendar'[Date],

"01.01.2015","01.09.2015"))