Forum Discussion
Only use fallback domain onmicrosoft.com for Office 365 for business
Hi all, I have added a domain foo.xyz to Office 365 for business. However, then I realized that all IMAP mailboxes at the foo.xyz provider do not work anymore, so I removed the domain foo.xyz fro...
Depends on how you want to use it. There is no requirement to use a custom domain, especially if you don't want to move your mailboxes to O365.