Quite a few forum members object to my statement that Outlook is not compatible with Blackberry. After all, Outlook is developed by Microsoft while BB is developed by RIM. Plus Outlook is also used by other companies.
The problem is you made an open ended statement without examples. It isn't perferct, but the Desktop Manager/Outlook combo is probably the most seamless solution for sync'ing a blackberry with a PIM app.
And you make the same open ended statements about yahoo and google and ask people to read behind the lines. It is only right for people to call you on it and ask you to back up your statements.
I don't use the user fields so I don't know what kind of problems there are. Or rather, I use them to some limited ad hoc extent on the blackberry but don't worry about how they sync with Outlook, or don't.