We have an instance of Odoo v9c and have issues with Odoo trying to continually download emails and over the last 2 weeks has downloaded over 200GB of data from a mailbox that barely has 1GB.

• Server 2012 clean VM

• Odoo v9.0c

• Email with Microsoft Online (from Telstra AU)
  

The server is continually downloading 2GB per hour via port 995.

Any advise where we should start investigating?