We announced at Ignite that we are actively working on bringing dynamic plus aliases to Office 365.
To get around existing usage, the plan is for an opt-in setting. Our ETA is to have this available for all customers by the third quarter of 2020.
I will keep you updated in Uservoice on our progress.Bee Dee supported this idea ·Bee Dee commented
Plain hotmail-a-la-outlook.com seems to support subaddressing.
Found a reference here: http://www.ghacks.net/2013/09/17/can-now-use-email-aliases-outlook-com/ (or somewhere), and tested recently with a public @outlook.com mailbox. (Can't find any Microsoft references to it)
Us poor Office 365 users need this as well...