Hmmm the visual studio developer was the RTM version? the had previously
installed Beta3refresh TF Explorer? if yes, they unistalled it before? I
think is strange behaviour, I haven't try this, but I migrate from RC1 to
final version without this problems, just uninstalled TF explorer RC1, and
installed final version.
Maybe they had some kind of beta .NET 2.0 framework, or beta version of Team
Explorer or VS 2005

Signature
Luis Fraile
MCSD.NET
> After migration from Team Foundation Server Beta3R, team of developers
> installed Team Explorer on their client. During installation, they got the
[quoted text clipped - 3 lines]
> Can they install Team Explorer without uninstall Visual Studio 2005, on
> other way?