Lotus Software produced the Lotus 1-2-3 spreadsheet program, and later developed Lotus Notes, a groupware and email system. Following its acquisition by IBM, the Notes and Domino client/server collaborative platform were expanded to include functions such as email, calendars, to-do lists, contacts management, teamrooms, discussion forums, file sharing, microblogging, instant messaging, blogs, and user directories. IBM also release SmartSuite, a comprehensive office suite, and followed that with Symphony, unrelated to the Lotus suite of the same name.
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Have you tried to repair the Domino server's installation (if you try to reinstall, the installer will ask you if you want to Modify, Repair or Remove the installation)?
I installed the Domino server v8.5 a few months ago, for testing purposes and there haven't been any problems.
Here's article about server's crash and hang troubleshooting:
http://www.ibm.com/developerworks/lotus/library/domino-server-crashes/
Hope this helps,
mb¤