Ok I have a Windows 256 Meg VPS. Before anyone suggests to upgrade to a larger VPS, let me just make it clear that this is not an option ( cheap Client ). Let me first explain my setup. I have the Windows 256 VPS which is intended to run two sites. Then I have a linux builder plan which runs the MySQL DB, Smarter Stats, Smarter Mail, for the big site that is hosted on my VPS.

When I first got ahold of my VPS the first thing I did was uninstall most of the crap that comes with it standard ( SQL server, and some other stuff ). But I still see alot of processes running. I am looking for ways to free up more memory for my App Pool. Right now I have capped my App Pool at 120 Megs. This works most of the time unless we send out alot of emails ( that sit in the SMTP queue in IIS ). What services can I uninstall or disable to Free up more memory?

Thanks in advance!

Have you tried a list server?

List servers are available from HMS for either really cheap or free ( http://www.hostmysite.com/support/list-server/ ).

Just call support and ask to set one up.

Other than that, Try AspQmail. Its pretty good for that kind of stuff.
You can limit all of the settings in C:\ASPCom\AspQMail\Qconfig.exe

This shows how to use it:

http://www.hostmysite.com/support/programming/aspmail/

There are also some html docs in C:\AspCom\AspQMail\ that go over using it. I know it has done wonders for some people.

If you are not processing stats, disable that too.

Start > Run > Services.msc

Smarter Stats Service -- Stop and disable (Again, if you aren't using stats)

-- Smarterstats web server
-- Smartermail Web Server -- These 2 are pointless. Really, there is no need for the smarter*web servers. This article shows how to set them up in IIS to save on resources http://www.hostmysite.com/support/vps/windows/stiis/

Make sure your asp.Net types are in different app pools. If you have a .net 1 and a .net2 site in the same pool... It will die... Fast. Separate them.

FTP Publishing service -- Disable that and go get Filezilla (http://www.filezilla-project.org)
It is WAY EASIER than IIS FTP

If you DO have sql installed and don't use it... Just stop the service. Uninstalling it on a VPS might not always end as expected.

Oh, and a Note for VPS Plus plan users ... DO NOT Put anything on the C:\ Drive. (if you have the multidrive config)

The C:\ on a multi-drive VPS is used stricly for windows-required files. Adding or removing things from C:\ can cause unpredictable results.