Unable to Import-Mailbox from .pst file to newly created mailbox on Exchange Server 2007 SP1

If you're unable to import .pst file to newly created mailbox using "Import-Mailbox" cmdlet check if the mailbox appeared in the Store. If it won't appear for a long time simply send an email for that mailbox and try importing again.

Error when trying to Export-Mailbox to .pst file (or import-mailbox) on Exchange Server 2007 SP1

When trying to export mailbox to .pst file in Exchange Server 2007 SP1 using Exchange Management Shell command "Export-Mailbox" I have encountered an error:
"Failed to copy messages to the destination mailbox store with error: MAPI or an unspecified service provider. ID no: 00000000-0000-00000000.."

To solve this run this command in Exchange Management Shell
"Get-Mailbox Add-MailboxPermission -User "" -AccessRights FullAccess"
and try exporting again.

Cannot install maiblox role on Exchange Server 2007 SP1: An error occurred. The error code was 3221684229. The message was Access is denied

If you're trying to install Exchange Server 2007 SP1 on Windows Server 2008 R2 RC as did I and get the following results for Mailbox Role:

"Mailbox Role
Failed

Error:
An error occurred. The error code was 3221684229. The message was Access is denied.."

try running Setup.exe in Vista SP2 compatibility mode and it should be ok.

Cannot install Exchange Server 2007 SP1: The system cannot find the file specified

If you are getting this error when trying to install Exchange Server 2007 SP1
Error:
The system cannot find the file specified

"Warning:
An unexpected error has occurred and debug information is being generated: The system cannot find the file specified"

you may want to check C:\ExchangeSetupLogs\ExchangeSetup.log for errors.
If the missing file is Ldifde.exe you should install ADDS.
For Windows Server 2008 R2 open Server Manager go to Roles, click Add Roles and install Active Directory Domain Services.
If you're installing Exchange 2007 Management Tools on Windows 7, simply copy the file ldifde.exe from your server to C:\windows\system32\ folder.

Clean System Installation v0.6

List of most useful free programs for freshly installed OS.

Antivirus:
Microsoft Security Essentials (recommended)
Avast Home
Avira Personal

File archiver:
7zip 32-bit
7zip x64

Browser:
Firefox
Chrome
Opera
Safari

Flash Player:
IE
non IE

.pdf Reader:
Adobe Reader
Foxit Reader

Java plug-in:
Java

Silverlight:
Silverlight

Burner:
ImgBurn

Imaging:
Photo Gallery
Picasa
Irfan View
FastStone

Codeck Pack:
cccp
K-Lite Codec Pack

Video:
VLC

Audio:
Winamp (recommended)
aimp2
Songbird

Malware Removal:
Malicious Software Removal Tool 32-bit
Malicious Software Removal Tool x64

Messaging:
Google Talk
Skype
Windows Live Messenger

Torrents:
Micro Torrent

Virtual Drive:
VirtualClone Drive

Mail:
Windows Live Mail
Thunderbird
Zimbra

Mail Spam Filters:
Spamihilator (works with Outlook 2000/XP/2003/Express, Eudora, Mozilla Thunderbird, IncrediMail, Pegasus Mail, Phoenix Mail, Opera, etc…)
Cactus Spam Filter (this spam stopper integrates seamlessly with all e-mail clients that use POP3)

System Maintenance:
CCleaner (uninstaller, registry cleaner, temp files cleaner and more)
Revo Uninstaller

HDD Maintenance:
Smart Defrag

Recover lost data (deleted files, formatted data)
Recuva