Hi:
I think SQL2000 does not allow on-line indexRebuild without single user status.

1. But from one server with maintenance plan, it looks like it could to it without knocking out all users connections.
2. Also, I doubt its result: did it really dropped and recreated indexes?
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Job 'DB_Weekly_IndexRebuild' : Step 1, 'Step 1' : Began Executing 2008-02-07 01:00:02
output
Microsoft (R) SQLMaint Utility (Unicode), Version 8.00.2039Copyright (C) Microsoft Corporation, 1995 - 1998Logged on to SQL Server 'ZYNXDB2' as 'NT AUTHORITY\SYSTEM'
Starting maintenance plan 'DB_Maintain_Weekly_IndexRebuild' on 2/7/2008 1:00:02 AM [3] Database CatalogAndVocabularyImport: Index Rebuild (leaving 10%% free space)... Rebuilding indexes for table 'Tbl_ABC'
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thanks
David