How to flirt with older women in E-mail? ?

There is this women at work who is probably 15 years older me but she is kind of sexy. I only see her about once a month but due to work we send emails every day. What is the best way to start flirting with her or let her know I am interested? Every time I write something and i re-read it it just sounds creepy so as of now I have kept it strictly business. What is the best way to break the ice in email. How to flirt with older women in E-mail? ?
I say start out by commenting on something mildly personal; what was on the mug she was holding, how she had her hair, her new skirt, etc. Seem casually friendly before even trying to flirt. Otherwise the creep-o-meter will go nuts. Get a somewhat personal conversation going then get a little more flirtatious. How to flirt with older women in E-mail? ?
well all this dirty little thing you notice when you do see her one a month would be perfect... and she will notice that you are taking notice.. and there you go.. Lil!! this happened to me however i was the older one.. and well lets just say we were on the same page when we talked about it !!! so go for it !! if you notice her hair a curtain way or something she has on .. or something she said .. not an e-mail something that came out of her mouth when u talked to her .. say something about it!! let her know you NOTICE her and you will see if the feeling are mutual with out being ';unprofessional'; have fun you only live once!! ...:) i did could not Waite to c him!! huge crush
First answer should be best answer. Just say something friendly before flirting. You definitely want this woman to think you are nice before she thinks you are a creep, which hopefully she will never think.
ask her casually if she wants to go to a bar or something, and at the end say, we should do this again...but maybe as an actual date