Exchange 2007 - Public Folders items a year old +

Hi all,
Just a quick question in regard to Exchange 2007 and public folders.  We have a calendar setup within the Public folder and I have just seen that some, not all, items from a year ago have started to disappear.  
Is there a setting I can change to stop Exchange archiving or automatically removing items.

Many thanks.
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Hendrik WieseInformation Security ManagerCommented:
I think this is caused by your retention period. Have a look at the following for directions:
EmanuelAuthor Commented:
Hi thanks for your input, but sadly that isn't for Public Folders, it is for Managed Folders.

Is there a similar thing for public folders?  I can't see any options in the Console, but there could be some command line function.

Hendrik WieseInformation Security ManagerCommented:
Sorry have a look here:

Under: 9.Use the Limits tab to view or configure storage quotas, deleted item retention, and age limits for the public folder. The following fields are available:
Hendrik WieseInformation Security ManagerCommented:
So on your public folder properties on the Limits tab you should be able to set the retention etc.

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EmanuelAuthor Commented:
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