Windows Server 2003 losing share

XP loses Mapped Drives after a few minutes (this process is carried out on the server)

XP does this by default (It's set in the registry) The ususal (default is 15 minutes) and its set in the following key..

HKLM\System\CurrentControlSet\Services\Lanmanserver\parameters

In here you will see autodisconect you can set its value in minutes (The valid value range is -1 to 65535 minutes)

To disable it completely set it to -1

For more info see
Mapped Drive Connection to Network Share May Be Lost
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q297684

In windows 2000 Server enviroments you can use the following command also
net config server /autodisconnect:-1

Then On the XP Client

Click Start >Run >Type "gpedit.msc" {enter}

Navigate to

Local Computer Policy >Computer Configuration >Windows Settings >Security Settings >Local Policies >Security Options

Scroll down to

"Microsoft Network Server: Amount of idle time required before suspending session"

The defaiut is 15 minutes change it to 99,999