I was cleaning up my work mail, which is in Outlook using Exchange. I was staggered to see a relatively short email taking an inordinate amount of space.

Copied the text including headers to a text editor. It was 6300 bytes. But Outlook claimed it was taking 485 Kb — some 76 times the amount of text.

How can this be?

The message was in HTML format. Ah… Microsoft-generated HTML, a receipe for bloat. It seems particularly bad when the message contains a whole email trail.

So, using Outlook’s very handy Edit Message function (I’m surprised it’s not abused more often), I changed it to Plain Text. It’s not as if anything in there relied on the HTML in order to be legible.

Switcheroo, save, presto! 17 Kb. Not 6, but not 485 either. Much better.

Shame there isn’t an option to clean up MS HTML.

Another thing one can do is zip the attachments.