How can I view or report on old syslog data?

You can use Web Access to search and filter the events you see.  I believe it is still space limited to 4GB based on the database engine used.  The best way would be to store the logs in a database or something like ElasticSearch.

Thank you very much.

you can also try our new beta of NPM that has a new engine for full-text search on Syslogs and it can also search syslogs per nodes. NPM unified and syslog search preview feedback welcomed.

I use our Log Viewer tool to sort through logs.  Please see this link:

http://www.kiwisyslog.com/products/kiwi-log-viewer/product-overview.aspx

We have a free version of this tool.