Hi Anoop;
PB added support for Extended MAPI in v12.6. Hopefully, that will be the key to ensuring your email interaction will continue to work with Office 2016. You will basically have to test PB 12.6 with Office 2016 to see. That combination of PB & Outlook is very new - so I am not sure if anyone is going to have a lot of experience in this area.
In the worst case, you might have to change from MAPI to SMTP.
Please let use know how you make out with your PB / Outlook testing.
Good luck!
Regards ... Chris