Microsoft Outlook is among the best free email apps because of its Office 365 integration and handy features ... because multiple users can access the inbox and share an Outlook calendar.

Focused Inbox helps solve the problem ... the message with S/MIME or Microsoft 365 Message Encryption. For details, see Microsoft’s “Encrypt email messages” help page.

Microsoft 365 subscribers will no longer be able to have personalized email addresses attached to their Outlook.com inbox. Outlook attachments will soon count against your OneDrive storage data ...

On Sept. 12, thousands of Microsoft 365 users reported outages, saying they were unable to sign into their email accounts or access other applications. Microsoft resolved an outage not long after.

The free version of Outlook on the web ... give you a chance of hitting Inbox Zero every once in a while. You can set rules based on the sender, keywords in the email, the number of recipients ...