I thought I would chime in here. I have had my exploder notices set to vacation for ~2 years or so (haven't been on vacation that long :-)) to cut down on email I get, but the issues we are having in WF5 made me come back to the exploder/forums and search and see what other people are saying. We have used both WF4 & WF5...just having switched to 5 about 3-4 weeks ago after using 4 for quite a few months. Our take...I would DEFINITELY stay with 4. WF4 was awesome.
While there are some nice enhancements with 5, the ribbon interface is really slowing us down. Most posts seem to point to work-arounds for the ribbon issue(s). If everybody is working around it, why is it there? I wish we could go back to 4 but it is probably too late for us. I have to say that this is the most negative feedback that I have ever had from an "upgrade".
As far as Intralink, we upgraded from 3.4 to 9.1 a few months ago. If you are just using Intralink for vaulting/data storage and management, I would stay with 3.X. We use windchill now and while it is very powerful, it is more restrictive (admittedly on purpose) and probably overkill for simple data management. We will be using it for change management and other things that are above the capabilities of Intralink 3.X. We found Intralink 3.4 M011 to be very stable and we knew it inside and out and could make it really work for us.
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