Has anyone tried to upgrade 6.01 to 7 Beta yet? Did you encounter any problems.
As Ray said above, we have done a lot of testing of 6.0[1] upgrades and expect unmodified servers to work properly. If not, please raise bugs in the proper place.
I am thinking about giving it a try. Have only installed dansguardian, gallery and dungogs mail contribs to a standard version.
None of those have been tested by the core development team. I know that Stephen Noble is watching 7.0 development and working to make his contribs compatible if they aren't already.
I don't know how dansguardian is plugged in, so I have no idea whether it will work, not work, or break something.
Gallery may be a problem - check the "sticky" thread in this forum for possible breakage/fixes for apache templates.
The mail contribs will need to be changed to work with qpsmtpd. They probably won't break anything, but also probably won't do anything either. Many of the features, but probably not all, are already in 7.0
There's another "sticky" thread above about testing contribs on 7.0 which is worth checking.