Iphone 4S stopped connecting to exchange

My phone recently stopped connecting properly to my work email. I initially connected with 2010 Exchange, and for about a year it worked fine. I changed my password due to expiration requirements, and now it will not authenticate the account. It will sporadically tell me that my password is wrong and then fetch my emails. I thought maybe if I deleted and redid the account it would work, but now it won't authenticate at all. I am unable to connect at all now. Has anyone else had a problem with this? It's driving me nuts!!
Thanks

What did your IT Department say when you contacted them about your work email not working.

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