In Exchange Server 2010, there is no more single instance storage (SIS). To help understand why SIS is gone, let's review a brief history of Exchange. During the development of Exchange 4.0, we had two primary goals in mind, and SIS was borne out of Read More

==Version 6.3 Updates== Bug Fixes Fixed the Secondary datacenter Active and Passive megacycle calculations to take into account the number of activated databases based on the failure mode the secondary datacenter can support. Fixed the number of Active Read More

There is potential for calendar related problems when new diagnostic logging for Message Access, which is available in Exchange Server 2007 Service Pack 2 (SP2) is raised from its default setting of Lowest.  A Knowledge Base article and a fix are Read More

MailTips brings together information from many sources; its value to users is taking what can be complicated on the backend and presenting it very simply. This does mean, however, that there are a few different places to look when troubleshooting MailTips.  Read More

Seeing that many will be finding a copy of Exchange 2010 under the tree soon (...right?), we wanted to let you know that we have been working to create the performance counter guidance for Exchange 2010 as we have for Exchange 2007 (see Monitoring Without Read More

EDIT 12/8/2009: Made a few modifications to the post and script based on feedback received. Working in Exchange Customer Service and Support, we often see cases where user performance, or overall server performance, is impacted because of a high number Read More

Six or seven years ago, I was faced with several cases where the permissions on public folders had been made non-canonical by programs running against the M: drive. This was back in the Exchange 2000 days when IFS was still around, and it exposed the Read More

EDIT: This post has been updated on 3/19/2010 for the new version of calculator. For the list of latest major changes, please see THIS. Overview The Exchange Mailbox Server role is arguably one of the most important roles within an Exchange deployment Read More

Introduction Users often delete data from their mailboxes that they later want recovered. Recovery of these deleted items is the most common reason for IT admins to recover data from traditional point-in-time backups today. With previous versions of Read More

We have released the Exchange Load Generator 2010 Beta to our downloads site. Exchange Load Generator 2010 Beta (64 bit) Exchange Load Generator 2010 Beta (32 bit) There have been several changes made since the last available build. Some of the "coolest" Read More

Download location:  Microsoft Exchange Server Jetstress 2010 Beta (64 bit) Jetstress has been updated to support the new IO characteristics of Exchange 2010. This build is now available for everyone to test with. CHM Help File The Jetstress 2010 Read More

A while ago I posted something on this subject, but - I wanted to let everyone know that Mike Lagase has just posted a very detailed troubleshooting guide for those problems on his blog. This is the most comprehensive collection of information on how Read More

You may experience problems performing mailbox move operations if the number of characters on a given Exchange attribute is greater than the default values defined by /SchemaPrep. Most commonly this issue occurs because of an administrative and unsupported Read More

You may find that recovery operations from online backup fail when the target of a restore is a Recovery Storage Group that exists on an External USB storage device. Most commonly External USB storage is implemented as a temporary measure due to lack Read More

There has surely been enough discussion on this blog (and other community sites) how Windows Server Backup on Windows Server 2008 does not provide any out-of-the-box functionality to backup Exchange 2007. Some examples on our blog are here and here, but Read More