#these need to match nsMsgSearchAttrib interface in nsMsgSearchCore.idl
0=Subject
1=From
2=Body
3=Date
4=Priority
5=Status
6=To
7=Cc
8=To or cc
# 9-15, not visible, but 13 now is
9=Location
10=Message Key
11=Age In Days
12=Folder Info
13=Size (KB)
14=AnyText
15=Tags
# for AB and LDAP
16=Any Name
17=Display Name
18=Nickname
19=Screen Name
20=Email
21=Additional Email
22=Any Number
23=Work Phone
24=Home Phone
25=Fax
26=Pager
27=Mobile
28=City
29=Street
30=Title
31=Organization
32=Department
33=reserved for AB
34=reserved for AB
35=reserved for AB
36=reserved for AB
37=reserved for AB
38=reserved for AB
39=reserved for AB
40=reserved for AB
41=reserved for AB
42=reserved for AB
43=reserved for AB
44=reserved for AB
45=reserved for AB
46=Attachment Status
47=Junk Status 
48=Label
# don't use above 49
49=Customize...