
It's a good practice to keep your messages on the internet mail account. This way, in case of the local system failure user still have a backup copy of his emails on the web server.
To leave your mail on the internet mail server you have to change settings in Outlook - the dialog window is identical in all versions of the program (Fig.1.)

Fig.1. Settings dialog window
The way to access this window is different for each version of Outlook.
Outlook 2007 or 2010
Go to Outlook 2007's Tools, Account Settings, in Outlook 2010, choose the File tab, Account Settings.
With the Account Settings dialog open, select the account and click Change. Then click More Settings. Browse to the Advanced tab.
Outlook 2002 or 2003
Tools, Email Accounts, View or change existing accounts, select the account and click Change. Click the More settings button and browse to the Advanced tab.
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Recently I switched my laptop from Outlook Express and desktop from Windows Live Mail to Outlook 2007 - both computers now running Outlook 2007. However, in the account settings on my desktop the option to "leave a copy of message on the server" keeps coming unchecked on its own and I subsequently stop receiving emails on my laptop. I recheck it but sooner or later it comes unchecked again. Any clues?