There is no "is confusing AquaMail" here, as (im)plausible as it sounds.
Please ask your company's friendly and knowledgeable IT people:
- If the new Exchange server supports something called EWS (Exchange Web Services)
- If so, what the server settings are, specifically for EWS (which are likely to be different from settings for ActiveSync)
PS - EWS and ActiveSync are different ways to connect to Exchange
PPS - If it's Office 365, please use Manual setup and enter outlook.office365.com as the server
PPPS - For the "hostname in certificate error" please change "security type" (in Manual server settings) from "SSL strict" to "SSL accept all"