1.
BCM - Business Contact Manager File
2.
BCMX - Business Contact Manager Customization
3.
CLX - Ceelox SecureMail Secure Message
4.
CVR - Microsoft Crash Report File
5.
DAT - Exchange E-mail Attachment
8.
FFA - Find Fast Status File
9.
FFL - Find Fast Document List
10.
FFO - Find Fast Document Properties Cache
11.
FFX - Microsoft Find Fast Index
12.
GXK - Galaxkey Secured File
13.
HOL - Outlook Holidays File
14.
ICAL - iCalendar File
17.
KMR - KnowledgeMill Link File
18.
MBOX - E-mail Mailbox File
19.
MIM - Multi-Purpose Internet Mail Message File
20.
MIME - Multi-Purpose Internet Mail Extension
21.
MME - Multi-Purpose Internet Mail
22.
MMF - Microsoft Message File
23.
MS-TNEF - MS Transport Neutral Encapsulation Format
24.
MSG - Outlook Mail Message
25.
MSO - Inline E-mail Attachment
26.
NICK - Outlook 2000 Nickname File
27.
NK2 - Outlook 2002 Nickname File
28.
OAB - Offline Address Book
29.
OBI - Outlook RSS Subscription File
30.
OLK - Outlook Address Book File
42.
OLM - Mac Outlook Database File
43.
OSS - Microsoft Outlook Saved Search File
44.
OST - Outlook Offline Folder File
45.
OTM - Outlook Macro File
46.
P10 - Certificate Request File
47.
PAB - Personal Address Book
48.
PRF - Preferences or profile file
49.
PST - Outlook Personal Information Store File
50.
PWI - Pocket Word Document
51.
RGE - Entourage File Archive
52.
RPMSG - Outlook Restricted Permission Message
53.
RWZ - Outlook Rules Wizard File
55.
TNEF - Transport Neutral Encapsulation Format
57.
VCS - vCalendar Event File
58.
WAB - Windows Address Book
59.
XST - Microsoft Outlook personal folders file