Scan - to file vs blank email and attachment vs Send to

Basic question - not sure if HP issue, Comcast issue or Windows XP issue
with HP all-in-one 4500 scanner.
I had a 12 page document to send via email.

In Windows I select Scan - it scans file into PDF fine at 300dpi. In My
Scans is a 14mb file.

1. I send as attachment in Outlook email it shows as 24mb file in the email.
I send it. In Outbox its 47mb !!
Comcast breaking it into pieces but I can't send him a 47mb file ! I
actually expected it to be 3-4mb. Cancel.

I right-click the file - send and it shows as 14mb in Outlook attachment. I
click SEND and outbox shows 24mb, but it starts to send it. It says part 1
of 3 , art 2 of 3 and then part 3 of 3.
I cc'ed myself and see, when it arrives:
1 10mb file attachment, another 10mb file in a second email and a 188kb file
in the third email.
In the first email there is a link - shows as 7mb. ???
Is that supposed to reassemble these files ?
I clicked - nothing happened.
I open 2 and 3 and they are not attachments but just postscript gibberish.

What is happening ? Is it me ? am I not doing something right ? Should I
save 3 files in a new directory and THEN click that hyperlink ?
NO I didn't investigate the link properties, I deleted the 3 emails. No info
at HP.

Why file size changes from 14 to 24mb as it breaks up ? Why 47mb in Outbox
??
I assume the 10mb breakup is Comcast limit but to break apart and send in
pieces ???
I've been messing with this for a few hours trying to 'learn' - you may have
heard me yelling .. yup that was me. I finally faxed the pages to him.

Anyone been here already and have a pointer to WHAT'S going on ?