What issues are there in upgrading from LabVIEW 4.0 up to LabVIEW 6.1?

I am "inheriting" a LabVIEW 4.0 application that is running on an old (133MHz) Pentium PC with the Windows95 OS. I would like to upgrade the PC to a more recent CPU running Windows2000. I also want to upgrade LabVIEW to version 6.1. Are there any issues in performing the LabVIEW upgrade? Will I need to rework most of the application or is the transition from LabVIEW 4.0 to 6.1 fairly painless and transparent?
Any help is appreciated. I've never been through a LabVIEW upgrade before and am treading in uncharted water.
Thanks.

Boy, it seems I can't stick my head above water without this topic coming up. I've had thr exact same upgrade question come up on two different contracts--in the past week!
In any case, the code itself should come across without major problems, unless you are using CINs. The only real trouble I'v had are with things like serial I/O as the drivers have changed dramatically over the years.
Now the code that you translate will be (by comparison) very inefficient thanks to the makor enhancements that have taken place over the last two major revisions.
For the most part, I would have to vote for "fairly painless".
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

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