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Unfortunately "moving to Office 365" for many organisations doesn't get rid of Exchange. Microsoft's article on "how and when" is basically a list of reasons you might be stuck with it.

https://docs.microsoft.com/en-us/exchange/decommission-on-pr...

> However, we have put little effort into how to get you from a hybrid configuration to the cloud only.

It's hilarious to see someone at Microsoft say the quiet part out loud.

Next thing you know they'll admit in writing that they have no plans for supporting Azure AD tenant to tenant trusts. Or, for that matter, tenant to tenant migrations as well...

I mean, think about it: Who would want that? Nobody with a KPI of on-prem to cloud migrations at Microsoft headquarters, certainly!

Yep, getting 365 means you still end up hosting your own stuff, also paying Microsoft to host copies of it, and basically doubling your attack surface.

Even if you move to O365/Exchange Online, you’ll likely always have some Exchange footprint. The only way to get around this is to migrate your AD to Azure.

“But at bottom, is Perl script”

Just like the rest of the universe.

https://xkcd.com/224/