While using Outlook, users get a 20MB cap on the file size of their attachment, i.e., a user can only mail file(s) as big as 20MB in one email. This size limit has been seen even with the latest ...

Increase attachment size limit on Outlook by adjusting registry settings or using cloud storage options. Send larger files easily without hitting size restrictions.

How does Outlook know I forgot to attach a file? Outlook has a built-in setting known as Attachment Reminder that warns the user about a missing attachment in the email.