Important:

Please use the Primary Link first – if that fails then resort to the Backup Link(s) 

ESX Redo Files Demystified
This document discusses how virtual disk modes work and their usages – and restates and adds to VMWare’s own recommendations. It then moves on to explain how REDO files are used to do “hot-backups” of powered on virtual machines 

Manage Citrix MetaFrame/Presentation Server Remapped Drives with P2V
This how to guide explains how to manage a physical Citrix Server which has its drive letters remapped with Citrix Remap tool. After the P2V you might find you cannot logon – this is because the drive letters have reverted to C: D: E:.

Sample P2V Post-Configuration Scripts for P2V (PDF) and Sample ISO File
 This how to guide explains how you can use various scripts to clean up a virtual machine once it has P2V’d

Processor Upgrade from 1-CPU to 2-CPU on non-ACPI compliant systems
This how to guide explains how take a 1-CPU system to a 2-CPU when the original server was a single-CPU and doesn’t support ACPI and how to automate the shutdown process

Use and Automate the Virtual Disk Shrink Feature (Legacy Article)

Update:
Since writing this document Mark Russinovich of sysinternals (recently aquired by Micro$oft) has released a new version of the sdelete tool. The new version of sdelete has a new switch which can be used to zero-out redudent/deleted files from a virtual disk prior to being exported for backup or transfer to another VMware vPlatform.

http://www.sysinternals.com/Utilities/SDelete.html

This guide explains what the shrink option does in VMware Tools and how it can be used to significantly reduce the size of an export virtual disk – especially useful if you use exporting as you method of backup.

Matt Pound from the VMware Community Forum has also been able to use Microsoft tools to automate the shrink process – and guess what it works inside a Windows virtual machine running inside VMware too. Read Matt’s document here

Convert VirtualCenter’s 1.x MDB database to SQL
This whitepaper takes you through the steps required to convert the VirtualCenter’s database from Access (MDB) to SQL. You can use this convert from MDB to a format that is compatiable with VirtualCenter 2.x which no longer supports MDB. This said if that is your scenario – you might perfer to chuck in the towel altogether and start with a fresh install