Can iOS 5+ support contact sync over ActiveSync for 15,000 contacts without freezing

I purchased an iPad 1 a year or so ago and setup my company email and contacts using Microsoft ActiveSync. We have 17,000+ contacts in our company database that are synced to all devices. We may need any one contact at any time out in the field and need it at the ready. That many contacts froze the iPad 1. I do not remember what version of iOS it was running. We are now looking into using iPhone 4S and iPad 3rd gen in our business and I want to know if I should expect the same with the devices totally freezing up when I try to setup activesync with that many contacts.

You will need to look in Apple's developer documentation
http://developer.apple.com/
or perhaps there is or will be an in depth review at Ars Technica
http://arstechnica.com/apple/

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