Actually it's "TO all intents and purposes", or, as originally used in an Act of Parliament under Henry VIII, "to all intents, constructions and purposes".
The OP who used "for intensive purposes" is without doubt an idiot but he does at least need to be corrected accurately:)
Every day's a school day.
Familiar, happy days. I cut my teeth on Slackware 3.4 floppies in 1995. In 1996 I treated myself by ordering Slackware '96 on CD-ROM. I remained a Slackware user up until 2008, when I finally switched to CentOS and now I use Ubuntu.
Happy days.