Sweedes2Turnips1 - that is not an office wife, that is an office SLUT!! Or the office, insecure friendless person whom your husband has been kind to on occasion and she has attached herself to him. She could just be lonely. Now you see, here is my stand on it - office husband, thats fine - i had one, hes one of my best friends, so now is his other half who was part of his office (well laboratory) hareem. If my DP were to have an office wife - totally unacceptable, but thats just me, i trust him implicitly but i am very insecure and i couldn't bear for my DP to have a female friend.
I would ask your hubby to have a word, alternatively, could you not show up at the office and mark your territory as it were, turn up for a lunch date etc. Make sure she sees, it would be even better of course if she were "stood up" so he could have lunch with his real life wife. Again, if this is the office lonely person, as apposed to the office slut, then it might be nice if you could meet her, you may become friends (you clearly have the same taste in men!) and then fix her up with one of your single male friends. Sorted!