Contacts and calendar items disappear when exchange server is off

Hi All
I've been having this problem for a few weeks now and it's most frustrating. My iphone is setup to sync over the air to our corporate exchange server. It seems that when the server is down for repair/patching ALL my contacts and calendar items disappear from my iphone. This doesn't seem to happen if the phone is out of signal?
I know that I can sync directly with Outlook, however this would then mean that the phone is only updated when synced with my laptop at work. If I sync both over the air AND with Outlook, I get duplicates of everything in my calendar.
I'm not restoring my iphone to factory defaults to get rid of the duplicates and go back to over the air sync only.
Does anyone have any ideas on how I can get calendar and contacts to work "offline" when the exchange server is down?
Main PC is running Windows 7 and exchange is 2007. This problem is only recent, I think in the last month of two. Nothing has changed other than the last few firmware updates from Apple.

hi, cheers for the info. That would make sense, however how come when I'm out of signal and not connected to wifi, the data doesn't also disappear as that too would render the server "unavailable".
Is there a way to make the iphone keep a copy of the data much the same as "offline mode" in Outlook where you can still browse your email, calendar and contacts when the server is offline, and it picks up where it left off when the server is available again?
I appreciate this may not be a "problem" as such, but is frustrating as all my contacts and calendar live in Outlook and I can't function without them
Message was edited by: spongmonkey

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Contacts and calendar items disappear when exchange server is off

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