We're on Exchange 2010 SP3 now: http://blogs.technet.com/b/exchange/archive/2013/02/12/released-exchange-server-2010-sp3.aspx which can be downloaded here: http://www.microsoft.com/en-us/download/details.aspx?id=36768 (Exchange 2013 CU1 is needed for upgrading)
Checking Exchange schema versions - http://social.technet.microsoft.com/wiki/contents/articles/2772.exchange-schema-versions-common-questions-answers.aspx
How to check the version of a Microsoft Exchange Server – RIM KB20412 - http://btsc.webapps.blackberry.com/btsc/viewdocument.do?externalId=KB20412
GCM exsetup |%{$_.Fileversioninfo}
Exchange server and Update Rollups build numbers - http://social.technet.microsoft.com/wiki/contents/articles/240.exchange-server-and-update-rollups-build-numbers.aspx
File-Level Antivirus Scanning on Exchange 2010 - http://technet.microsoft.com/en-us/library/bb332342(v=exchg.141).aspx
Proper virus exclusions for servers hosting the OAB - http://blogs.msdn.com/b/dgoldman/archive/2010/05/12/proper-virus-exclusions-for-servers-hosting-the-oab.aspx
Exchange 2010 datacenter switchover tool now available - http://blogs.technet.com/b/exchange/archive/2012/10/19/exchange-2010-datacenter-switchover-troubleshooter-now-available.aspx
RBAC: Walkthrough of creating a role that can wipe ActiveSync Devices - http://blogs.technet.com/b/exchange/archive/2012/09/12/rbac-walkthrough-of-creating-a-role-that-can-wipe-activesync-devices.aspx
Exchange, Stubbing, and Database Space Reclamation - http://blogs.technet.com/b/exchange/archive/2012/08/27/exchange-stubbing-and-database-space-reclamation.aspx
Exchange Server 2010 Monitoring Management Pack re-released - http://blogs.technet.com/b/exchange/archive/2012/09/06/exchange-server-2010-monitoring-management-pack-re-released.aspx
TimMcmichael's blog (Microsoft) which contains some good Datacenter Activation Coordination articles: http://blogs.technet.com/b/timmcmic/
Creating ActiveSync Device Access Rules Based on User Agent in Exchange Server 2010 - http://exchangeserverpro.com/activesync-device-access-rules-user-agent
Get-DAGHealth.ps1 – Database Availability Group Health Check Script - http://exchangeserverpro.com/get-daghealth-ps1-database-availability-group-health-check-script
PowerShell Tip: Fix All Failed Exchange Database Content Indexes - http://exchangeserverpro.com/fix-all-failed-exchange-database-content-indexes
Download Free Exchange PowerShell Scripts - http://exchangeserverpro.com/powershell
How to Deal with SSL Requirements for Exchange when Certificate Authorities Won’t Issue You a Certificate (Using a Name No Longer Valid Under New Rules) - http://exchangeserverpro.com/ssl-requirements-for-exchange-when-certificate-authorities-wont-issue-certificate
One liners: List All Users Who Have Send-As Access To Other Mailboxes - http://www.ehloworld.com/1643
Maximum number of Exchange accounts in an Outlook profile - http://www.slipstick.com/exchange/maximum-number-exchange-accounts-outlook-profile/
Changing the default *.pst and *.ost sizes - http://www.slipstick.com/outlook/config/changing-the-default-pst-and-ost-sizes/
Organizational Forms Library in Exchange 2010 - http://www.slipstick.com/exchange/2010-exs/organizational-forms-library-exchange-2010/
Outlook is slow when using mapped drives - http://www.slipstick.com/outlook/outlook-2010/outlook-slow-mapped-drives/
How to successfully add and seed a database copy: http://blogs.technet.com/b/timmcmic/archive/2012/12/04/exchange-2010-adding-database-copies-to-databases-with-a-single-copy-results-in-copy-status-failed-after-seeding-is-completed.aspx
Datacenter switchover - http://technet.microsoft.com/en-us/library/dd351049
RPC Client Access Cross-Site Connectivity Changes - http://blogs.technet.com/b/exchange/archive/2012/05/30/rpc-client-access-cross-site-connectivity-changes.aspx
PowerShell Script to Generate Email Traffic in a Test Lab Environment - http://www.mikepfeiffer.net/2011/08/testing-exchange-autodiscover-with-powershell-and-the-ews-managed-api/
Powershell Script for Collection Events Logs from multiple servers and generating a single html report - http://blogs.technet.com/b/parallel_universe_-_ms_tech_blog/archive/2011/09/29/powershell-script-for-collection-events-logs-from-multiple-servers-and-generating-a-single-html-report.aspx
Shell variables - e.g. $ExBin, $ExScripts - http://technet.microsoft.com/en-us/library/bb124036.aspx
Three ways to tighten OWA 2010 security - http://searchexchange.techtarget.com/tip/Three-ways-to-tighten-OWA-2010-security
PST Capture 2.0 - http://blogs.technet.com/b/exchange/archive/2013/02/22/time-to-go-pst-hunting-with-the-new-pst-capture-2-0.aspx