Have iphone5 & ipad 3 with Outlook Exchange 2003 emails. Random emails aren't delivered to my IOS devices but appear on my PC. Using no filters or rules. Is there a fix?

Have iphone5 & ipad 3 with Outlook Exchange 2003 emails. Random emails aren't delivered to my IOS devices but appear on my PC. Emails have no attachments nor am i Using any filters. Is there a fix?

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