Symantec BRIGHTMAIL - SYM ANTISPAM AND Installation Manual page 55

Installing Brightmail Scanner for Windows
If you see the following error, either you don't have the Windows SMTP Service
installed on this computer or you attempted to install the product on a non-Server
version of Windows, such as Windows 2000 Professional. The Windows SMTP
Service is part of Exchange 2000 and 2003.
The Brightmail Client requires the Windows SMTP Service to block spam.
You can also, in the Custom Setup dialog box, click the appropriate icon to expand
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the list of customization options for a component
.
Click Space to test your available disk space against the space requirements for the
selected application; click Change to specify a different drive or folder for
installation.
Make any changes you want, and then click Next.
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Installation Guide 49