Hi,
Yes, Aqua Mail does provide calendar sync for Exchange.
It's done "the proper Android way":
Your calendar events are stored "in the Android Calendar database" and can be viewed in any Calendar type app (pre-installed by the device manufacturer, Google Calendar from Play, a third party app...).
Same goes for Calendar widgets for your home screen, you can use any calendar widget app.
If you don't see your account's calendar events there, please make sure that calendar sync is enabled in Aqua Mail.
For this, please long press on the account on Aqua Mail main screen -> options and folders -> Exchange options.
Nadia