The easiest way to increase attachment size in Outlook is to edit MaximumAttachmentSize DWORD file value in the Registry Editor on Windows to the desired size and save it to increase the attachment ...

After that, select the Attach File or Pictures option to attach a file or image to your email template. Once done, you can save the email in Outlook Template format using the File > Save As feature.

Outlook for Windows 11 now has the ability to add multiple recipients to replies, access attachments offline, and more.

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