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 Importance header.
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<111> use a Priority, X-Priority, or X-MSMail-Priority header instead of an Importance header 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 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<112> 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 |