Class or type name not found: UIMEMODOCUMENT

When opening email I get the following errormsg: Class or type name not found: UIMEMODOCUMENT

After upgradig from WinXP to Vista and from Notes Client 6.5.6 to 7.0.3

I have tryed to refresh design and fixup on DB. What else can I do?

Update design to 7?

Server version is still 6.5