It seems to be possible to have some kind of job running, that collect mails from my Pop3-mailboxes (external ones, from ISP, web-hosts and such) and puts this mail into some Folders on my machine, right?
Any email program will let you config for, say, checking email each ten minutes. Kmail, MozillaMail or Evolution are good linux email clients.
Can these folder be "shared" amongst KMail/MozillaMail and some kind of WebServer/Webmail interface that I can use when I'm at work or otherwise not at home???
I guess not. But if you want you can check email within each one of them and have several copies of your messages. Just let only one client to delete email from server.
Also, if your plan is to access remotely, you can also use Pine, the Program for Internet News and Email, default in every modern linux. Very solid. You can use a ssh server at home and a winscp3 and putty clients in your winxp to access it. I do it at work (win98) to access my suse at home every day. Pine can work through a ssh session.
My computer is always online, have a static IP, and all that, so I figure it wouldn't be too hard to setup a webserver, right?
Right. Install Apache and be happy. You can also do ftp.
What I would like to achieve with this, is that mails that I'm sending via the webmail-interface will turn up in KMail (or whatever mailprogram I use at home)??? ....maybe even sorted into the right folder allready???
Hmmm... not sure. If you prefer webmail, look for OpenWebmail.
I like to organize my mail, so that I have both the incoming and outgoing mails in the conversations in the same folder...
Is this possible, and more important : Is it somewhat easy to set up for a Linux newbie as me???
Yes, its easy. And you can rely on the help of the community.
Should I "go all the way" and setup and old comp (PII, 350mhz, 384MB Ram) as a dedicated server running an IMAP-server of some sort (only accesible from the "inside"), that also will act as a firewall, Nat-router and all that for my home-computers??? ...and if I did so, would it be possible to do a VPN-connection from my Laptop (Windows XP, off course), through this server, to my work???
Yes, its possible. A little advice: set one server at a time. Every small accomplishment will get you more confident and encourage you to keep going.
If you are curious: these guys (www.coyotelinux.com
) have made a distro that runs off a floppy and do a lot of server stuff on a diskless 486 pc! Very cool!