So I open up Notes 7 this afternoon and it tells me it wants to delete my old mail (because disc space is costly, after all). Gmail provides me 2.8G free storage, but IBM needs to purge my mail regularly to save space. Whatever. I decline its polite offer, but being a good Corporate Citizen, I decide to clean up my inbox myself, and get this lovely error message. I now have an inbox with deleted messages (marked with an 'x') I can't actually delete.
Maybe it's time to take zx's advice and step up to Notes 8 beta.