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IIRF doesn't recognize deleted iirf.ini
IIRF does not clear all rewrite-rules when an iirf.ini is deleted.
For example, an iirf.ini with:
RewriteRule /.*$ /blah [L]
Navigate to the site where the rule is applied. Now, when you delete the iirf.ini, the rewrite-rule will still be applied untill the application pool is recycled (tested on IIS6 only), rather than clearing all rules upon deletion of the iirf.ini file.