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Plesk 9 allows for the ability to choose a default webmail client. The options are horde (IMP), squirrelmail, and none.
Note: This is set per domain.
Log into Plesk. From the home page, locate the Mail section and click Mail Accounts. You will be presented with a list of domains. Click the domain you wish to set.
In the Tools section at the top, click Mail Settings. Under Preferences, choose the desired webmail client from the dropdown list. Click OK.