2.2.39 [RFC5545] Section 3.3.13, URI

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V0049:

The specification describes the URI data type.

Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019  

The only type of URI that Outlook exports is the "cid:" type URI, as specified in [RFC2392].

On import, Outlook ignores any URI type properties that are not of a valid format, or do not use one of the protocols in the following list:

http, https, ftp, mailto, news, oms, webcals, webcal, stssync, outlookfeed, outlookfeeds, tel, callto, im, sip, conf, meet, oba, onenote, file (to a local file), msn, nntp, pnm, mms, outlook, stssync