Hi,
In my last project we had upgraded without any issues.
I strongly suggest to test it first in your development environment.
The way we did was first to test it in DEV and then in UAT environment. It also depends on what features of CRM 4.0 you are using or what is your CRM setup (whether it is used through IE or Outlook, is there IFD deployment, etc.). My advise would be to give
it a quick test and if required a thorough test.
I hope this helps.
If my response answered your question, please mark the response as an answer.
Ashish Mahajan, CRM Developer, CSG (Melbourne)
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