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2.2.3.2.5 Importance

To set the value of the PidTagImportance property ([MS-OXCMSG] section 2.2.1.11), clients SHOULD write the value to an Importanceheader (2).

MIME readers map Importance header values to values of the PidTagImportance property as specified in the following table.

Importance header value	PidTagImportance property value
Low	0x00000000
Normal	0x00000001
High	0x00000002

Clients MAY <112> use a Priority, X-Priority, or X-MSMail-Priority header (2) instead of an Importance header (2) to set the value of the PidTagImportance property. In that case, MIME readers map the header values to values of the PidTagImportance property as specified in the following tables. However, if an Importance header (2) is present, MIME readers SHOULD use its value in preference to any of the others.

Priority header value	PidTagImportance property value
Non-Urgent	0x00000000
Normal	0x00000001
Urgent	SHOULD be 0x00000002, MAY <113> be 0x00000001

X-Priority header value	PidTagImportance property value
5	0x00000000
4	0x00000000
3	0x00000001
2	0x00000002
1	0x00000002

X-MSMail-Priority header value	PidTagImportance value
Low	0x00000000
Normal	0x00000001
High	0x00000002

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