Microsoft is offering a free upgrade at http://www.microsoft.com/directaccess/products/catalog/sbsbeta/.
Unlike the retail product, this free version does not include Microsoft Office 2000.
To upgrade (quoting Microsoft):
1. Microsoft strongly recommends backing up the SBS server prior to upgrading. Microsoft always recommends backing up a server prior to upgrading the software that is running on it. Backing up the SBS server can be accomplished using a tape backup device and the Backup utility software (click Start, click Programs, click Administrative Tools (Common), and then click Backup). 2. Write down the Company name, Address, Telephone, and Fax numbers as you want them to appear in the Company Information screen. 3. Document the password for the Administrator's account. This password will be needed during the upgrade process. Steps to upgrade the server: 1. Log on to the SBS server as Administrator. 2. Close all open or running applications on the server. 3. Disconnect all users from the server. (In the Console, click Tasks, click Manage Users, click Manage Connected Users, and then click Disconnect All Users.) 4. Insert the Small Business Server 4.5 Disc 1. The Microsoft BackOffice Small Business Server window should appear. Click Small Business Server Setup to continue. 5. Complete the upgrade as prompted. For a step by step guide to the setup process, see chapter 12 in the "SBS 4.5 - Start Here Guide." For more information about how Microsoft products are affected by year 2000 (Y2K) issues, please see the following Microsoft World Wide Web site:http://www.microsoft.com/y2k/