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<p align="center"><font size="5" color="#0000ff">idx outlook express (ie4) index file

format<br>

</font></p>

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<td width="100%">by jeff evans<br>

<br>

idx file format<br>

----------------------<br>

<br>

index size description<br>

-------- ------- ----------------<br>

1-4 4 bytes file id (the ascii string &quot;jmf9&quot;)<br>

5-8 4 bytes sub-id (the hex value 0x04000100)<br>

9-12 4 bytes number of items in the index file (number of e-mail<br>

messages)<br>

13-16 4 bytes file size in bytes<br>

17-20 4 bytes ? (seems to contain the hex value 0x01000000)<br>

21-24 4 bytes ? (seems to contain the hex value 0x10000100)<br>

25-64 40 bytes string composed of 0x00's<br>

<br>

<br>

index items immediately follow this header. each item has the following<br>

format:<br>

<br>

index size description<br>

-------- ------- ----------------<br>

1-4 4 bytes flags (see below)<br>

5-8 4 bytes ?<br>

9-12 4 bytes entry number (unique for each index item)<br>

13-16 4 bytes ?<br>

17-20 4 bytes remaining size in this index item, including the size<br>

of this value and the size of the end buffer<br>

21-24 4 bytes ?<br>

25-28 4 bytes size of the message, in bytes<br>

29-194 166 bytes seems to be mostly empty, usage was unclear<br>

195-202 8 bytes date message received (a win32 filetime structure)<br>

203-210 8 bytes date message sent (a win32 filetime structure)<br>

211-212 2 bytes ?<br>

213-216 4 bytes size of the subject field in bytes<br>

217-x x bytes subject field (an ascii string - length is<br>

specified by the preceding value)<br>

x-x 4 bytes size of senders e-mail address in bytes<br>

x-x x bytes senders e-mail address (an ascii string - length<br>

specified by preceding value)<br>

x-x 4 bytes size of senders name in bytes<br>

x-x x bytes senders name (an ascii string - length specified<br>

by preceding value)<br>

x-x 4 bytes size of pop server in bytes<br>

x-x x bytes pop server message was retrieved from<br>

x-x 5 bytes ?<br>

x-x 4 bytes size of username used to log into pop server<br>

x-x x bytes username used to log into pop server (an ascii<br>

string)<br>

x-x 4 bytes size of the name of the mail account<br>

x-x x bytes name of the outlook express account that<br>

corresponds to the pop server<br>

x-x 8 bytes ?<br>

x-x 0-3 bytes variable length buffer which is used to make the<br>

length of the entry an even multiple of 4<br>

<br>

<br>

notes:<br>

<br>

the size of the index entries is measured from the &quot;remaining size&quot; value.<br>

this value is calculated such that it is equal to the number of bytes<br>

between the start of this variable and the end of the variable length<br>

buffer.<br>

<br>

each index entry has a set of flags which describe it's properties. a normal<br>

message appears to have a value of 10h. messages that are marked as read by<br>

the mail client have a value of 12h (you can perform a bitwise and on the<br>

flags using 2h to determine if the message has been read. ex:)<br>

<br>

if (dwflags &amp; 2)<br>

(message is not read)<br>

else<br>

(message is read)<br>

<br>

there are probably other values to indicate attachments and priorities, but<br>

i did not attempt to work these out.<br>

<br>

<br>

i can be reached via e-mail at: evansj@triceris.com or evansj@shaw.wave.ca<br>

<br>

<br>

jeff evans.<br>

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