Why do you want Windows Mail to be able to try to send messages so
large that most email providers will reject them? A typical limit is
10 MB per message.
If you want Windows Mail to at least try to break it up into pieces,
click on Tools, then Accounts, then your email account, then
Properties, then Advanced. If there is no checkmark in the box
before Break apart messages larger than, click on this box, then
Apply; then adjust the allowed size until it is close to your email
provider's limit, but not quite that high, then click Apply again.
Click on OK, then Close.
Note that whoever you're trying to send the video to may have an
even lower limit on the size of incoming messages.
Also note that when Windows Mail complains about not having
enough memory, the actual problem is often interference from an
antivirus program, which Windows Mail seldom seems to be able
to report correctly. What if any antivirus programs do you have, and
have you ever had a Norton or McAfee antivirus program on that
computer, even one of the free trial versions that often come already
installed on new computers?
You could always try uploading the video to a web site meant for
storing videos, then email a much shorter message saying how to
download it from that site.
