Exchange 2010 Calendar activ sync issue

I have a number of users who have "smart phones" , they have either Blackberry, HTC Hero or  Iphone 3gs. Of all of them I have 1 blackberry user who can sync perfectly. The rest sync Mail & contacts ok, but not calendar. None are members of domain admins or server admins, they belong to domain users & remote desktop only. They have inherited security options applied.
Richard GrayIT & QA ManagerAsked:
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sandeep_narkhedeCommented:
Do you get any error while synchronizing calendar, could you provide the error code?. This is basic, but is the calendar checked to sync in the folder options on device?
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Richard GrayIT & QA ManagerAuthor Commented:
There is no error on exchange. We've done some more testing today & the the calendar that wont sync to the HTC Hero  will sync perfectly well to an Iphone
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sandeep_narkhedeCommented:
If this is Device specific then did you try to upgrade the AS version on the handset?
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Richard GrayIT & QA ManagerAuthor Commented:
The hanset is as up to date as HTC say it can be
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Richard GrayIT & QA ManagerAuthor Commented:
Update:
Finally got conformation from Vodaphone that its a known problem with Heros ! So we've ditched them
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