Hotmail exchange doesnt delete emails on iphone

[Jesskit]

Just wondering if anyone knows about this. I have my hotmail account set up on my iphone 3gs (latest iOS) as an exchange account. It syncs well except for one thing. When i delete mail from the web based hotmail service it does not delete from my iphone for a long time (i have 435 new emails atm, most should be deleted). Deleting them off my iphone does delete from hotmail, but I dont want to go through 430 emails. Any help or info would be great