Using Exchange 2007 reverse proxy Activesync rule - Emails gone from Phones

Had 2 over the Easter weekend - Come back in and old emails are gone? - Is there a default setting when it removes emails or something?
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philb19Asked:
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philb19Author Commented:
Also getting a few of these

Synchronization with your iPhone failed for 1 items.
Microsoft Exchange was unable to send the following items to your mobile device. These items have not been deleted. You should be able to access them using either Outlook or Outlook Web Access.

 

 
 Item Folder:
 Inbox
 
 
 Item Type:
 IPM.Schedule.Meeting.Resp.Pos
 
 
 Item Created:
 4/6/2010 12:02:17 AM
 
 
 Item Subject:
 Accepted: Updated: Jim & Luke - Fortnightly Catch-up (4-5pm)
 
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Justin OwensITIL Problem ManagerCommented:
I have seen that second issue (http:29855712) crop up when the default calendar on the iPhone is not set to the Exchange calendar.
As far as your actual question, what are you specifically seeing and asking?
Justin
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philb19Author Commented:
Thanks  - Question is 1 or 2 phones came back in from weekend - with all emails from pre-weekend missing? - does an activesync phone set to only hold emails for a set period?
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philb19Author Commented:
DrUltima:

There is no option in 3gs iphone to change the default calander - ???  followed instruction - and no option there to change default cal
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Justin OwensITIL Problem ManagerCommented:
You only get the option to select default calendar, if memory serves, if you have more than one calendar on your phone.
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