Check Exchange Queues
Get-Queue cmdlet allows to check mail queues on the Exchange server.
Check Exchange Service Status
This command is helpful in quickly seeing which services are running particularly after a reboot.
Mailbox and User Counts with PowerShell
There are a few examples to display how many users you have in AD, how many users that are enabled and also how many that are disabled.
Find Deferred Messages in Exchange
Here is a quick little one liner to find all the deferred messages with FromAddress, Recipients and DeferReason.
Verifying Your Backups
Your backup is of no value to you if you can't restore it.
What are some cases where EDBUTIL/ESEUTIL should be run? Is there an article regarding information store startup problems?
You should be very careful running EDBUTIL or ESEUTIL in repair mode.
How to setup a disaster recovery server
You may need to set up a Microsoft Exchange Server computer to recover information from the Exchange directory service contained in the Dir.