If you're hosting your email with Microsoft's Office 365 service, you may be using shared mailboxes. You should if you aren't, they're a great way to create email addresses that don't consume a license.
I've been trialing Ubuntu 19.04 on my Dell XPS15 for the last couple of weeks and I was wanting to use an external mouse with the machine. I dug around in my drawers and found an unused Magic Mouse 2 not being used.