Another alternative to consider:
For some years I have used the free Mozilla Thunderbird client to manage all of my personal mail accounts locally on PC or laptop, and keep the webmail clients for the rare occasions when I am not using one of my own machines.
Two of my accounts are Hotmail, and this works as well for them as it does for any of the other IMAP or SMTP accounts.
One nice feature in this - which fits with what you want to do, G-CPTN - is that I can simply drag and drop e-mail between folders for different accounts from different e-mail providers as well as easily save e-mail as local files (file extension .eml) on a computer.
There are many other reasons too that I use Thunderbird but I'll keep this post to the point.
