Joost sent me a very useful tip: an explanation how to increase your Hotmail inbox size for free.

Traditionally the inbox of a Hotmail account is 2 MB but last year, when Google announced GMail, Hotmail planned an upgrade to larger mailbox sizes. For some reason, this increase is only available to people in the U.S. However, using Joost's tip, which basically comes down to temporary changing your address to a U.S. based one, you can get the large Inbox even when you live in Holland.

Right after I executed the trick, I got a 25 MB size account, and an hour that was increased again to 250 MB.

Not as large as GMail, but much better than the original 2 MB. Thanks Joost!