I observed this problem recently on my own Mac, where Lync would crash with the latest patch applied (10.7.2) and it had me stumped. I’d updated to take advantage of iCloud with iOS5 on my iPhone, and it killed Lync on me. 🙁
Fortunately, Apple man of wizardry Mark Coughlan has posted an awesome fix for this problem over on his tech blog, which turns out to be caused by some certificate keychain in OSX. Check it out here.
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Awesome! this was correct and right on the money Little bit of research is that this is created during install of Lync also and non upgrade