Support Will ICS OS Upgrade remove rooting

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http://androidforums.com – I have samsung captivate glide with android with OS 2.3.6 (gingerbread?). I've been a unix/linux guy for a few decades but am new to phone android OS. I am wondering if I root this phone and then upgrade soon to ICS will my rooting prevent upgrade or might I need to do the rooting again. Perhaps it's best to just wait a bit, upgrade to ICS and then root. Thanks for ideas, Tom Kosvic (General)