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Office 365 is a cloud offering, you don't install it anywhere local. Subscription options can be found here.
Try item["Modified"] = null; That should make the Date/Time field empty.
Unfortunately, it cannot be done in CAML. If you have to use CAML, the recommended approach is created a calculated column such as =DATEDIF([NoticeSentDate], [NoticeDate],"d"). Your CAML query would then look for values greater than 0 in the calculated column. Check out this page for more examples of date calculations in calculated columns: ...
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