Hi @WPF2Web ,
Unfortunately it's not possible to name worksheet tabs in SSRS 2005. That feature was added in the 2008 R2 release. Depending on how criticial it is, you could post-process the excel documents using VSTO, however you would need to create a custom application to do that (either a custom rendering extension or application that proxies a call to report server web service render() method.
Best Regards,
Joy
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