Where Outlook files are located

Where Outlook hides its Files
First unhide hidden files:

To see hidden files, to turn on file extensions, select the Tools menu from any Explorer window Explorer, not Internet Explorer). Under the tools menu, select Folder options. Then, select the View tab from the folder options window, as shown in Figure B.
FIGURE B

Description
Extension
Location
Outlook data files
.pst
drive:Documents and Settings<user>Local SettingsApplication DataMicrosoftOutlook
Offline Folders file
.ost
drive:Documents and Settings<user>Local SettingsApplication DataMicrosoftOutlook
Personal Address Book
.pab
drive:Documents and Settings<user>Local SettingsApplication DataMicrosoftOutlook
Offline Address Books
.oab
drive:Documents and Settings<user>Local SettingsApplication DataMicrosoftOutlook
Command bar and menu customizations
.dat
drive:Documents and Settings<user>Application DataMicrosoftOutlook
Navigation Pane settings
(includes Shortcuts, Calendar, and Contact links)
.xml
drive:Documents and Settings<user>Application DataMicrosoftOutlookOutlook.xml
Registered Microsoft Exchange extensions
.dat
drive:Documents and Settings<user>Local SettingsApplication DataMicrosoftOutlook
Outlook contacts nicknames
.nk2
drive:Documents and Settings<user>Application DataMicrosoftOutlook
Rules
.rwz
drive:Documents and Settings<user>Application DataMicrosoftOutlook
Print styles
Outlprnt with no extension
drive:Documents and Settings<user>Application DataMicrosoftOutlook
Signatures
.rtf, .txt, .htm
drive:Documents and Settings<user>Application DataMicrosoftSignatures
Stationary
.htm
drive:Documents and Settings<user>Application DataMicrosoftStationary
Custom forms
drive:Documents and Settings<user>Local SettingsApplication DataMicrosoftForms
Dictionary
.dic
drive:Documents and Settings<user>Application DataMicrosoftProof
Templates
.oft
drive:Documents and Settings<user>Application DataMicrosoftTemplates
Send/Receive settings
.srs
drive:Documents and Settings<user>Application DataMicrosoftOutlook
Message
.msg, .htm, .rtf
drive:Documents and Settings<user>My Documents

outlook 2007 user could not get free busy data information neither in online nor cache mode.

outlook 2007 user could not get free busy data information neither in online nor cache mode.

These 2 methods below resolved this issue. Try any
1. Re-created outlook profile for user and problem was fixed
OR
1. Exchange Admin moved the mailbox to new storage group and possible was resolved

admin moves user from exch2003 to 2007. mailbox is identified as legacy in the console

synopsis: 
user(admin) moves a user from exchange 2003 to exchange 2007 using exchange 2007 console, the moved mailbox shows up as legacy mailbox and user is not able to login
Error:
Although the mailbox was moved to the target Exchange server, an error occurred while the policies were being applied. Proxy address policies, Unified Messaging settings, managed content settings, and Exchange ActiveSync settings may not be set correctly. Active Directory operation failed on server. This error is not retriable. Additional information: Insufficient access rights to perform the operation.

resolution:
Using powershell, run
set-mailbox alias -applymandatoryproperties
user will now be able to logon

Convert resource mailbox to shared mailbox using pshell command

Convert resource mailbox to shared mailbox using this pshell command:
set-mailbox pep-employees -Type:Shared
The purpose of the share parameter is to create a mailbox that is accessed by other users, a general mailbox.
In Exchange 2003 and Exchange 2000, you had to use shared mailboxes to represent resources.
When you move these mailboxes to Exchange 2007, they will be Exchange 2007 shared mailboxes.
You must convert them from Exchange 2007 shared mailboxes to Exchange 2007 resource mailboxes so that they will have all the properties of Exchange 2007 resource mailboxes.
To use the Exchange Management Shell to convert a mailbox
To convert a shared mailbox to a resource mailbox, run the following command:

Set-Mailbox ConfRoom1 -Type Room
You can use the following values for the Type parameter:
Regular
Room
Equipment
Shared

To grant “Send on Behalf Of” permissions to all users on a distribution list

To grant “Send on Behalf Of” permissions to all users on a distribution list:
1. In Outlook, log on to the mailbox to which you want to give access.
2. On the Tools menu, click Options.
3. On the Delegates tab, click Add.
4. Click the distribution list to which you want to grant “Send on Behalf Of” permissions, click Add, and then click OK.
5. Choose the delegate permissions that you want, and then set Inbox to Author or Editor for “Send On Behalf Of” permissions.
6. Click OK, and then click OK.

Error:The distribution list has reached maximum size for your network e-mail server. No new members could be added

The distribution list has reached maximum size for your network e-mail server. No new members could be added
solution: see this MS KB article

User cannot login to mailbox due to incorrect and dual primary SMTP addresses

Issue:
User could not login to mailbox. Discovered that user had incorrect and dual primary SMTP addresses. Deleting the extra primary SMTP address was not possible via Exchange mgmt console or ADUC
Resolution:
From ADUC, admin renamed the primary smtp addresses to match. By doing that, Exchange reverted to just one primary smtp. User was able to login afterwards